What a lovely assortment of Homespuns you got! I made this quilt out of nothing but homespuns and used a standard 1/4" seam allowance with no issues. The cat's ears are 1 1/2" UF HST on the large cats and 1" U/F on the little cats. Reduce your stitch length and quilt sufficiently (this one was a 2" grid done on point) and I don't think you will have any issues with fraying. My homespuns were all across the board, from LQS to walmart.
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