Swim suit

A swim suit or bathing suit is a general term for the type of garment worn for swimming and bathing by men and women. For men, it is usually in the form of short pants or briefs, while for women, it is either in a single piece outfit that covers the torso or in a two-piece outfit.

In mainstream Smurfs media, the male Smurfs would either wear shorts (as in the cartoon show) or briefs (as in the comic books).

Emily's universe
In Emily's universe, a swim suit is body wear that the Smurfs, Smurfettes, and Smurflings wear in the pool. All the Smurfs, Smurfettes, and Smurflings have their own signature design, but the males most of the time wear a white swim suit.

Empath: The Luckiest Smurf stories
The male Smurfs in the EMPATH: The Luckiest Smurf story series generally wear shorts as swim suits, though there are some like Empath and Swimmer who wear briefs. Smurfette and Sassette generally wear a single-piece suit, though the former has worn a two-piece suit.

Singapore's universe
In Singapore's universe, it is worn by most Smurfs when they're going for swimming. The apparel can come in any design or colour.