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J A N U A R Y 1 5 , 2 0 1 3
S TA RTING A N IND IE P A TTE RN C OMP A NY P T. 2
(my finished hot cocoa sweater pattern as it looks in Adobe Il
lustrator)
Ok ladies and gents, get ready to roll up your sleeves and dig
in. We're getting deep into the seething underbelly of this
pattern drafting thing. First we're gonna get that sucker on the
computer then we're gonna draw up some charts and
graphs and after that we'll gonna slice 'er open and check out
all those crazy mathematical insides. It's gonna get messy
A B OUT D IX IE
F OLLOW
A B O U TS H O PP A T T ER NSS EW I NGC R A F T SB L O G L O V
ES P O NS O R
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up in here!
Vague references to hog butchery aside, this is the tricky bit
in the pattern company process and requires some
attention. If you need to catch up be sure to read Pt 1 on the
How I Started and Indie Pattern Company!
I'm assuming most of you know some basics about pattern making
and terminology. You may or may not know about
the software I'm using and there's a chance you'll need to
remember your high school geometry class. However, if
there's anything you don't fully understand, leave a comment and
I'll try my best to clarify.
The software I am using is Adobe Illustrator CS6 on a Mac.
Getting the base paper pattern on to the computer
There are two ways (maybe there's more but I'm only writing
about two) to digitize a pattern. The first method is one I
don't use because I think it takes too long - it's the scanner
method. Basically, you cut up all your pieces to fit on
individual printer sheets of paper then scan each page in to
Photoshop or Illustrator. This method works best with single
size pattern or if you make multi-size patterns you will be
better off doing all your grading by hand and scanning all the
sizes nested together. Otherwise you'd need to reassemble all
your pattern pieces, re-trace the lines and then grade
from there in your image editing program.
Here's an explanation of how to do the scanner method.
The method I use is this:
P A TTE RN S HOP
B A D GE
P A RTIC IP A TE
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(a bodice piece that I'm going to digitize)
I tape each piece on to my big grid cutting mat. I use another
ruler and protractor and I measure all my lines and points
and recreate the pattern outline on a gridded Illustrator
document. I do this for each piece. Rectangular pieces like
collars or cuffs or some waistbands are easy, you just need two
measurements. Since I grade digitally this takes me
much less time than scanning.RE C E NT F A V ORITE MA K E S
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(on the left, all my reference line measurements help to make
the final pattern piece, on the right, in Il lustrator)
From there I remove seam allowances if the paper pieces had
them. If my paper pieces didn't have SA then I'm good to
go. Your pieces need to be SA-free in order to properly grade
them.
Here is a helpful video of how I add/remove seam allowances in
Illustrator.
Creating a standard size chart and how grading works
In order to grade a pattern up or down multiple sizes you'll
need to create your own size chart. The key here is
proportional consistency between sizes.
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Above are size charts from several pattern companies: Grainline
Studio, By Hand London, Victory and Colette. You'll
notice that their sizing differs from each company but in each
chart their sizes change proportionally. Colette's size 6 is
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notice that their sizing differs from each company but in each
chart their sizes change proportionally. Colette's size 6 is
36"/28"/38" which has an 8" difference between bust and waist
and a 10" difference between waist and hip. Colette's
size 8 is 37"/29"/39", a 1" increase overall from size 6 but the
bust-waist-hip ratio is the same. It is proportional.
If the size 6 was 36/28/38 and size 8 was 38/29/40 that would
not be a proportional grade. If you wanted to do a
disproportional size grade you'd have to draft two completely
different master patterns.
This proportion idea is why cup sizes in pattern pieces always
stay the same throughout sizes rather than a size 4
having and A cup and a size 14 having a DD. It just doesn't work
like that. That's why those "pick your own cup-size" style
patterns from the big 4 companies have separate pattern pieces
for each size and cup size.
You can go though any pattern company's size chart and do the
math. If ever the bust-waist-hip ratios change from one
size to another then you know the makers drafted a whole new
pattern for that other set of sizes.
Typically you draft a middle size and then grade up and down
from there. The trick is that you can only safely grade up or
down two or three sizes before you start to warp the edges of
the pattern and lines get wonky and skewed. That's why
companies often draft two sizes like a 6 which can be graded up
to an 8 and 10 and down to a 4 and 2, and also draft a
14 and grade up to a 16 and 18 and down to a size 12, or
something like that. If you fit one of your own "middle sizes"
in
your size chart then great! If not, find a buddy to do test
fittings and pattern tweaking.
If you are making children's patterns you'll probably have to
draft an infant size, toddler size, child and tween size (or
something like that) because children's' body proportions change
so much between development stages. In fact, this
post from Sew Mama Sew has a lot of good info on kid pattern
drafting and also general pattern selling info. Definitely
worth reading!
Grading methods for a program that's not meant to grade
CAD (Computer Aided Drafting or Computer Aided Design) programs
like Adobe Illustrator or Corel Draw are not
designed to be pattern drafting software. Real pattern drafting
and grading software that isn't for personal use only is
extremely costly and you'd still have to convert the pattern
pieces from the specialty software into something like
Illustrator for home sewing use. Maybe one day I'll buy software
for drafting but I in no way have the budget right now.
Patternmaking(sort of...)
Dixie DIY's Year inReview 2012
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Obviously you could hire someone to do this for you but if you
did that you wouldn't need to read this post so I'll just show
you what I do.
The two manual methods of pattern grading are the slash and
spread (where you cut up a pattern into sections and
spread each section apart from the other) and the shift method
(where you shift the whole piece outward at specific
points). Here's a tutorial on shifting and Elegant Musings has a
great tutorial for slash and spread.
With these methods you determine how much to increase your
pieces horizontally based on your overall garment
measurement (say, a 2" increase) and divide by how many sections
your pattern is (one half piece for the back and one
half piece for the front makes four "fourths" so you divide your
overall increase by four, or 1/2" on the front and the back
piece). You do the same vertically as well.
In Illustrator you'd use the shift because the program makes it
simple to select lines and move them vertically and
horizontally by specific measurements. After all your points are
shifted you still have to go back and reconnect all your
lines. It's a little time consuming but pretty accurate.
Here's a very simple video to show you what I mean with the
shift method in Illustrator.
Another non-kosher method, and I'll explain why, is what I like
to call the "percentage" method. This is something I totally
made up so don't take this as gospel.
Essentially, you find the percentage increased vertically and
horizontally between each size based on the most important
pattern measurement (hips for pants, bust for a top or dress,
etc).
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(scaling in Il lustrator)
Take this bodice piece above for example. My size 4 has a bust
size of 34" and my size 6 is 35". The bust measurement
is the most important measurement of this pattern I'm designing.
The increase from 34" to 35" is ~2.941%. That's my
horizontal increase. Let's just say my vertical increase is
2.2%. I copy my entire pattern piece and scale it up by these
percentages.
I like this method for a couple reasons. In many cases it works
very well. I think it even creates nicer armhole curves than
the manual shift method. Unlike the other grading methods I
don't have to divide some overall measurement by half or
fourths depending on my number of pattern sections. The same
percentage works for everything.
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In the image above you can see lines from a bodice piece (side
seam is on the bottom left) that I graded up one size.
The black lines were manually graded by shifting points and then
adjusting all the points back together. The pink lines
were "percentage" graded. In this case I think the percentage
grade is nicer than my (sloppy, in this case) hand grading.
Both of these methods have the problem that if you grade up or
down more than two or three times you run the risk of
lines getting skewed.
The percentage method has more problems, however. It works best
when the pieces run the full length and width of a
body section, meaning a bodice piece should go from shoulder tip
to waist and side seam to center front. If you're
grading a bustier type bodice piece that doesn't extend to the
shoulder and you try to increase it by a vertical percent that
piece won't lengthen as much as a full shoulder to waist piece
because you don't have as much length to lengthen to
begin with. Make sense? Ok, maybe not, I'll give some more
examples.
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A shirt piece like this won't take too kindly to the percentage
method either. When grading horizontally you are increasing
around the body from side seam to center front (if you are using
a 1/4th section bodice piece). In a kimono/batwing
sleeve like this the computer wants to increase from the far end
point, which in this case is the wrist of the sleeve, not
the side seam. You're better off grading manually or breaking
the pattern piece down into two sections (basically, cutting
off the sleeve part) and percentage grading separately.
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Here's another example - set in sleeves. The percentage method
works well with set in sleeves (that are positioned
upright, like the pic above). You increase using the same
amounts that you used for the other pieces (based on the most
important measurement, like the bust, be consistent!).
But for a gathered tulip sleeve like the pic above the standard
percentage method won't work because this pattern piece
is oddly wide.
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What I did instead was overlap the pattern piece like a regular
set in sleeve would look like with side seams on the left
and right and graded from there then reassembled the pieces back
like a tulip pattern piece.
What about a front bodice piece that isn't on on the fold but
rather has an extension past the center front for a button
placket? You need to grade based on the side seam to center
front so you'd have to chop off that extension and add it
back after you've graded. Odds are that the placket would
probably be the same dimensions no matter what the size so
you wouldn't have wanted to grade that bit anyway. Gotta think
about these things!
The percentage method works ok with pants and skirts (use the
hip measurements) sometimes. I don't always use this
method because it doesn't work in every situation but even if I
do use this method I always need to double check my
work. I'll usually check by shifting specific points on my
pieces up two sizes at a time to make sure everything matches
up.
Yeah, grading sucks. It's time consuming, is uses a boat load of
math and it makes me wish I had 10 grand to drop on
some sub-par poorly designed software made specifically for
grading but I don't so I'm just going to complain about it
instead.
The more you practice the quicker it gets. I make up plenty of
charts denoting increase percentages for every size to
reference.
After you finish grading you can add back your seam allowances.
The reason why you have to grade sans-SA is
because your SA always have to be consistent. You can't be
slowly increasing your 5/8" SA by 2-4% each time you grade
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up or by the time you get 6 sizes larger you'll have 1" SA
rather than 5/8". No bueno!
***Phew, that was a lot to take in at once! But you made it out
alive and now we forge onward deeper into the abyss (wow,
I started out with some weird surgery metaphor and now I think
I'm referencing Heart of Darkness, see what a mess
pattern drafting makes of me!!?!?).
Next time we'll talk about easier, but still important topics
like pattern piece labeling, printing layouts, instructions,
line
drawings, graphics, and selling. So go grab a snack and we'll
meet back here later. Remember to stay hydrated!
LO V E, DIXIE @ 1:19 PM 18 COMMENTSLA BELS: INDIE PATTERN
COMPANY
18 Comments Dixie DIY.com
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Suzanne a year ago
It has always stumped me how to get a pattern I drafted into
Illustrator (short of ripping it into strips and shoving theminto
the disc drive). Thanks for this post. It's a lot of complicated
ground to cover.
Reply
Lisa a year ago
Thank you so much for sharing! I am in the process of becoming
an Indie pattern designer but had yet to figure outhow all this
digitizing works. Now I know! And I'm excited to start :)
Sarah a year ago
Thank you for share this, it's very insightful and nice to know
that illustrator can be used for this type of thing too!
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soisewedthis a year ago
I've been bookmarking your posts so that I could read when I had
more time (which I just did). These are reallyinteresting to me
esp. because I use illustrator every day at work and seeing how
you're using it for patterns isintriguing. Very cool :)
Reply
Amy a year ago
Very helpful post, Dixie! I have a grading book that helped me
write down my grading rules. I'm just geeky enoughthat I might try
and write a macro for it! You're right in that it gets quicker the
more you do it and you start to see whatneeds to happen.
Reply
Madalynne a year ago
You and Einstein should hook up :)
Reply
Elisalex a year ago
Amazing! What a great post - and oh god amen to the hell that is
grading! Serious salutations to you for taking thetime and effort
to share all this information.
Reply
Scruffybadger a year ago
Loads of fascinating info, thank you for taking the time to
write it all up to share! Not that I'm a pattern maker, but
it'svery interesting to read about grading. Thank you
Reply
dixie a year ago
yes, having a digital file is great. i'm always losing one piece
or another around my sewing room. it's nice to know ican always
print out that piece if i need to.
Roberta a year ago
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This is very interesting and helpful. Thanks for the time you
are putting into it. I want to learn more!
Reply
Heather Lou a year ago
Lady, you are the best. This is so chock full of seriously
intriguing info I am squirrelling it away for the spring when Ihope
to launch something (just very small to start). It is incredibly
generous and kind of you to share all thisinformation, which
clearly took you a lot of time and trial and error to find out.
Sending you digital high fives.
Reply
Keren Duchan a year ago
This is an excellent post and very inspiring. It would be much
better than storing my self-drafted pattern piecesaround the house
and most probably losing them! Saving this for later :-) Thanks so
much for sharing!
Reply
Kelli Ward a year ago
This is SO helpful. I am actually working on my first pattern
right now and so this couldn't have come at a better time.
Reply
Katy a year ago
Thanks for information. This is really interesting and
informative!
Reply
Toni-Maree a year ago
Thanks for this post! Amazing info, which no one else seems
willing to type out, so thanks again!
Reply
liza jane a year ago
Fascinating! Not because I want to digitize patterns, but simply
for all the info on grading. I've always been stumpedby grading and
how it works. The whole proportional issue is veeeerrry
interesting. Thanks for this write up!
gingermakes a year ago
Wow, this is detailed! So interesting to read about your
process!
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House of Pinheiro a year ago
This is amazing information darling. I got a few self draft
patterns I wanted to share free. At ,east I go an idea what ittakes
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