It seems I should've expanded on my comment. The skirts worn at my store are not worn for religious reasons (I did look up short mini-type skirts and no religion deems those appropriate attire.) they're worn to get around the no shorts policy. IDC what people wear, but if it's skirts for religious reasons then that's what it should state with a length (similar to how schools enforce a dress code.)
Completely my fault for not broadening my statement sooner. I apologize.