Pros of this pattern:
Cons of this pattern:
Sewing a casing for the elastic may be unnecessarily complicated
The button above goes to Arcady Genkin’s revised version of the two patterns below. It has French seams and buttons. But they are all very similar.
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Instead of a casing, try stretching the elastic as you sew and using a zigzag stitch. This saves a half inch of fabric on the bottom…no need to fold over a casing or thread the elastic.