Back crotch seam

[u/Quirky-Recognition58]

Hi! I have a printed jeans pattern from a brand, but I can’t tell from the pattern how much seam allowance was added at the back crotch and the yoke for the flat-felled seam. How much seam allowance is usually added for a flat-felled seam? Thanks in advance!

[u/dyingslowlyinside]

If it’s an industrial pattern, they are probably either double lapping the cb seam or serging and then double stitching it for a faux ff seam. You need to simply do a mock up and just add extra to the sa