In article , Julia Altshuler
writes
"M. Wetmore" wrote:

As Mary Ellen Hopkins says "the only important thing about a seam
allowance is that you are consistent". So, if you want to use a 3/8
inch seam allowance, go ahead. Just make sure that you do it
everywhere, though.

I believe this is true if you're working with squares and rectangles. I can't
see that it would matter for paper piecing where you're sewing on the line and
trimming the seam allowance afterwards. And for triangles, you'd have to redo
the math. The old "add 7/8" to a square" when cutting half square triangles
wouldn't work."

That is true if you are rotary cutting. But if you are marking around
templates then you can add any seam allowance you like.
--
Mel Rimmer