Percentages for scaling up a pattern! By CarlaC (LouiesMama)

Origianally posted by CarlaC (LouiesMama)

I was looking at the size charts in my patternmaking textbook, and it seems
like the larger "tween" sizes increase pretty proportionally. I did the math
to
get the differences in the sizes so that the pattern pieces could be
scaled up
on a copy machine.

to go from an 8 to a 10, scale up
103%
to go from an 8 to a 12, scale up 106%
to go from an 8 to a 14, scale
up 110%
to go from a 10 to a 12, scale up 103%
to go from a 10 to a 14,
scale up 106%
to go from a 10 to a 16, scale up 110%

You'll want
to go to a place like Kinko's that has nice machines so you can
adjust the
scale to whatever you want, and also so you can select a larger paper
size
(I think you can go up to 11X17 in most machines).I haven't tried this
personally (I just do the scaling in my drawing program), but these are the
percentages I would use. This should work for most patterns (not just mine)
that
are free-fitting like the peasant top/dress. With more fitted styles,
keep in
mind that as girls develop, the hip/waist ratio changes, and also
the bustline
changes. So for something like the a-line, scaling up might not
work. Boys are
easy - they stay pretty much the same until they either get
big muscles or a
beer belly !