I'm finding that JoAnne's is not the place for Civil War civilian wear, either. I have found underpinning fabrics there, but none of their many cotton prints are even remotely suitable for the 19th century, and their wool is both expensive and part synthetic. .
They have linen that might work...but yeah..
Online is really the best way to buy DIY material that is exactly what you want. With Joan's, you have to compromise. You can easily use their ripstop and batting for a quilt. But the ripstop is heavy, as well as the batting. Plus the ripstop isn't that much cheaper that really light ripstop online.