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Work out the minimum and maximum scaling (lengths can be in inches or mm, but be consistent):
Circumferential fabric stretch (-10%) %
Shoulders straight
Shoulders curved
Doffing surplice (armpit-neck-elbow-armpit)
% For the shoulders straight/curved measurements you've entered, fabric must be able to stretch this much.
% Don't use a tighter scaling than this.
% Don't go tighter than this if you want to be able to curve your shoulders.
shortest armpit-neck-armpit neckline for surplice
Longitudinal fabric stretch (-10%) %
Back straight
Back bent
Belly straight
Belly bent
% For these back measurements, the fabric must be able to stretch at least this much
% Don't use a tighter longitudinal scaling than this
% Don't go tighter than this if you want to be able to touch your toes
% Loosest scaling if you want your belly taut when you're touching your toes

The rest works like this:

Enter your own measurements in the large box below (I've pre-loaded mine as an example), then press the button.

Press to... um, calculate.

This page uses Javascript, so you can save this page and use it offline if you like. You can even edit it to pre-load your own measurements, just don't use a wordprocessor: use Notepad or your computer's equivalent.

Incidentally, you might notice that although you've measured the lengths between the circumferences along your skin, those distances are being handled as if they were measured along your bone, and must actually be longer (Pythagoras, triangles, and all that). Fret not: having calculated the matter for my own measurements, the largest relevant discrepancy was 3mm, which is easily compensated for by fabric stretch and cutting inaccuracy.

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