I agree that you don't necessarily have to come out or explain dysphoria to get around the problem. Lots of women wear swim shorts over their bathing suits if they're self-conscious about their hips, thighs, or bikini area, so you could use that as an excuse if you use a pair of fairly neutral athletic shorts. In a way, that's dysphoria, too, y'know? I think it's much harder to use that excuse when it comes to wearing anything other than a women's swimsuit on top. . .