There are a lot of people for whom swimsuit season sucks. Trans people are, more often than not, part of those people. Just for different reasons. Swimsuits, public showers, and swimming pools are a special brand of complicated for trans people.
For binary gender trans people- there are loads of concerns depending on how far/if you’re transitioning medically. A trans woman who is consistently read as a woman, has taken estrogen to grow breasts, but still has a penis- well, you can imagine how much fun crotch-tight swimsuits are for her. For a trans man who has breasts, he has to wear a binder and then likely wear a shirt that won’t show the binder over it. Also, finding a packer that works with water is fun-times.
And for non-binary people, it’s often just complicated.
I’m bringing this up as a person who’s gotten top surgery… but still has scars. They’re a lot better than they were, but one of my nipples looks really weird thanks to the #@$#@$@ surgeon. I’m right now staying with people who have a pool (being poor and staying with rich people is… really weird). My partner won’t be using it because of their own dysphoria. I want to… but. But I don’t know if it’d be okay for me to just wear my swim trunks. I don’t really want to have to wear a shirt in the pool, I’ve never liked that. It’s an awkward question to have to ask.