Hello Seamly2D forum!
Anyone have experience with the swimsuit draft from Aldrich? And changing out her ease measurements to stretch % s? Or is there a (better) alternative source? I presume I can use the pattern to then create separate swim suit or underwear patterns. I can’t think of a reason why this wouldn’t work. But maybe I am wrong? If anyone has any input, I would appreciate it!
I would say it depends on the fabric you want to use, and how much smaller the pattern is, allowing for stretch. If a pattern draft is sized to use Lycra it may not work well with a cotton fabric commonly used in underwear. But yes… typically the botton portion of a 1 piece bathing suit (leotard) is the pattern for underpants.
Define side-to-side stretch percentage as a variable H_stretch (orig_width/stretched_width), also up-down stretch percentage V_stretch (orig_height/stretched_height).
When using vertical body measurements (like neck_front_to_waist_f) in pattern formulas, multiply the measurement by V_stretch (neck_front_to_waist_f * V_stretch). Similarly for horizontal body measurements (like waist_arc_b) multiply by H_stretch (waist_arc_b * H_stretch)
Even better, create new variables that are the body measurements multiplied by the stretch variable. You then use the new variable names to create your patterns, so you’re spared all the extra typing.
neckf2waistf_stretch = neck_front_to_waist_f * V_stretch
HTH!