I wear a bikini top and board shorts (could put tucking underwear underneath?). It's feminine enough and is not as revealing.
Swimsuits with skirts are pretty good, and you can always add a gaff if you want.
Leolines on Etsy has a bunch of different swimsuit styles for transfemmes. It's a bit pricey but they make quality stuff.
So a dude here in norway has a trans webshop and the brands I see on there are Nereida and TransMissie/UNTAgG. Unsure what sizes they have available
If you can find a bikini skirt in your size that's probably a good way to avoid future incidents :P
Have you checked Rubies? Rubyshines.com
I haven't tried them but I've heard good things and they seem like a great company.
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