Key West Swimwear

[PSDave]

I had a couple minutes so did a Google search of gay mens swimmer shops in Key West.
The one that stands out is called Graffitti on Duval (305-295-0003). It has been there since 1987 and was described in one review as "not for the metrosexual - this is hardcore gay" This may not be the shop, but it fits the description you had. I don't see a website but you now have a phone number so give them a call.
If you have time, you may want to check the gay publications for Key West for ads for menswear shops. At least I have a start for you.

PS You can also call one of the gay resorts there and ask them about shops -- even though they are "optional" resorts, they probably know the shops and you can describe the one you were in and they may know it.

Good Luck