How do you say tank top in Spanish?
Well, in where I was in Mexico it'd be camiseta, (since t-shirts are called playeras there.)
Outside of Mexico, I don't know.
Welcome to the forum mh... I'm not sure this would be correct, in fact I doubt it but I'm as curious as you so I'm going to watch this question. Anyway T-shirt is camiseta. Stick around I have a feeling this one will get a lot of response.
I call it camiseta. However, I have heard some other people who call it tubo (for me it is a strapless shirt).