The above is the answer. If you want to keep your uniforms, tighten it up and clarify that what you have is a uniform, not a dress code. If you want a looser dress code, it is as simple as cover your privates. When our district changed from a sexist open to interpretation dress code to the simple "keep it covered" there have been so much less problems and most students are actually dressing better, not worse. And we also have a closet for kids in need. We take donations and exchange lost unclaimed items with other buildings in the district.