Athletic/swim skirt without shorts??

Hi everyone, I'm trying to be a bit more modest when I workout, and I'd like to find a skirt (short or knee length) in athletic or stretchy material to wear over my leggings when I work out for a little extra coverage.

However, almost everything I have found has built-in shorts! I don't really want these as I already have a bunch of full-length leggings that I prefer to work out in, and I don't think it would be comfortable to try to wear both.

Does anyone have any leads/ ideas for this?