mizu do you already tuck? If not you could try and then normal swimwear might work.
You could order gaffes to help with that.
I've tried tucking with the japanese method and medical tape to secure everything. It does work. But can be uncomfortable for long periods.
For some reason it gave me a mood crash later (while not on hrt. I imagine it was messing with harmones in somw way.). So i avoided it later. But since you're on hrt you may not have that effect.