I just got the info and fabric samples on the Mitchell Company organic cottons. Their email is firstname.lastname@example.org. The phone number is 800 870 5312. They are only open Tues, Wed., and Thurs. and Mabel is the only person in the office.
She said that no chemicals are used in the processing of the fabric. Some of the samples are jacquard weave and one, a med. large paisley is really incredible--the outlines of the paisleies are raised and woven in tan. These nicer ones are $8.65 for $50 yards but the rest are closer to $5.00 ($1.00 more for cut yardage). Some are definitely too light for slipcovers.
I'll order some samples to test.
New business: Jean Hutchins Chemical Glues and Toxic Fabric Lint Upholstery and Natural Slipcovers, Inc.