A flat-fell seam is traditionally used for shirting. However, Folk shirts appear to use a french seam approach.
Shoulder Apex:
Close up of french seam:
Total seam allowance is 9mm:
Topstitch seam is around 2 to 4mm:
Armpit stitching details:
A flat-fell seam is traditionally used for shirting. However, Folk shirts appear to use a french seam approach.
Shoulder Apex:
Close up of french seam:
Total seam allowance is 9mm:
Topstitch seam is around 2 to 4mm:
Armpit stitching details: