What do you do with a fabric that frays while sewing?

serge the edges......or do you have a serger?? You could zig zag them
instead.

On fabric which frays really badly, I prefer to simply staystitch all around
the edges of each piece as it is cut out, and decide later how to finish the
seams. (But then, I really do not care for the look of serged edges in most
fabrics.)

Olwyn Mary in New Orleans.