I have my favorite Banana Republic sweat shorts circa-1994 that have finally been stretched to their limits. Looking to replace them with old school-style pants and shorts (ideally lightweight 100% cotton, with a straight leg - no elastic on the cuffs). Anyone have an idea? If not, what do you work out in that is 100% cotton (I am amazed by the people who can work out in polyester track pants. I would melt.) Many thanks.