Rash Guard Slip Shorts. I think these are exactly what I’ve been looking for! I wear a skirt…, July 05, 2017 at 09:53AM Rash Guard Slip Shorts. I think these are exactly what I’ve been looking for! I wear a skirt everyday to work and have tried several products to avoid the dreaded thigh chafe! I tried powders, gels, bandelettes, and the jockey shorts but found that most of them either didn’t last, rolled up, or fell down. So I finally decided to give the undersummers a try.