Umm... Never has come up. I don't know if "trust" is the right word here... my husband would NOT shop for that for me. He just wouldn't. He knows how difficult I am to please about certain things and he wouldn't subject himself to the fallout.
Generally, he is very good at picking out clothes for me, but a bathing suit he would not be willing. Frankly, I hate doing it myself. Women's sizing is absurd from one brand to the next they aren't even close half the time, and then when you are talking about something so form fitting like a bathing suit, you are essentially buying a bra that everyone will see.... and when was the last time I walked into a store and picked up a bra and bought it without trying it on?? uh... NEVER. Because even within the same brand and the same size, different styles of bras fit very differently.
So... it's just something that really wouldn't ever come up.
Nice that he totally disregarded your color choices, though. LOL Maybe that's all they had?