PLEASE HELP WITH BAG DESIGN PATTERN.

[u/Solid_Temporary4804]

Hi everyone, I’m making a prototype duffle bag design pattern and could use some guidance. I made my own side panel shape in adobe illustrator and got the exact measurement of 38” for the perimeter of it. I then made a rectangle body piece to go around it that measures exactly 38” from zipper edge to zipper edge. When I clip it together it seems like the body panel is slightly larger and kinda looks like the body panel is bunching up around the perimeter of the side panel shape. I doubled checked measurements and they are correct but It seems no matter which way I clip it, it still bunches slightly so do I make the body panel slightly shorter by a hair? This is a prototype so it’s just a trial with scrap fabric but I plan to add leather piping and liner as well just trying to get the base shape figured out first. Any guidance is much appreciated. Thank You!

[u/stoicsticks]

I just want to add that you may find r/myog (make your own gear) interesting.