I think I did it as instructed (but memory doesn't always serve). Stitch seam, trim one allowance to 1/4", trim the other to 1/2", fold the 1/2" over the 1/4" and stitch along the fold. This results in three layers of fabric next to the seam.
Perhaps it should be only two layers? If I trim one allowance to 1/8 and the other to 3/8, so the two raw edges meet instead of overlapping but are both still encased and captured by the stitching.
The flat-fell finish is certainly nicer than the overcast raw edges, if I can get it right!
Proudly Duncan [maternal], MacDonald and MacDaniel [paternal].
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