They're called 'muscle tanks' or 'muscle shirts' :)
Internal shirt
just like a “sleeveless” or my personal favorite, "bro-tank"
Tank tops, or more specifically, "bro tanks" They're just tank tops with wider sleeves. In the second one, especially, you can tell that they just took a T-Shirt, and cut the sleeves out. Just cut it like this!: A lot of people now are calling them "bro tanks" when the bottom of the sleeve comes down as far as those ones do.
