Swimwear

Swimwear is a category of clothes that a Sims game has specifically designated as being available for swimming, hot tubs, hot springs, and saunas.

Various exceptions apply:

• Sims with the Never nude trait will wear swimwear in the shower and in the bathtub.
• Sims with the Insane trait or the Lunatic moodlet will pick a random outfit from any outfit category for swimming.
• If The Sims 3: Late Night is installed, adult and elder Sims can "Skinny Dip" in hot tubs and swimming pools if there are no teens or younger on the lot, and that any teens or younger Sims on other lots are approximately 25 squares away or further. This will generate a pile of clothes nearby that other Sims can hide, leaving the affected skinny dipper embarrassed and putting on a towel.
• Under normal circumstances, mermaids, Servos, mummies, SimBots, and Plumbots don't have swimwear outfits.
• The process to designate additional existing outfits as swimwear in The Sims 3, is very complicated, but can be done with S3PE and detailed searching-through of FullBuild(…).package files.

Gender swimwear standards

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Gallery

An unknown man in shorts jumping into a pool, The Sims Bustin' Out promo material.

Red onepiece female swimsuit, The Sims 2.

Woman in pink onepiece and man in baggy shorts, The Sims 2.

Chloe Singles in a twopiece swimwear.

Woman in blue twopiece swimming at a beach lot while the game is paused, The Sims 2: Bon Voyage

Typical male swimwear in The Sims 3, almost all available options for which are baggy shorts.

Woman with the Never nude trait taking a shower with swimwear on.

Female twopiece swimwear.

One set of female swimwear in The Sims 3: Ambitions.

Another set of mens' baggy shorts, this time from The Sims 3: Island Paradise.

The sole normally available outfit used for scuba diving in The Sims 3: Island Paradise, a shortsleeve wetsuit.

Male and female versions, but with the leg ends cropped off.

Player-made female Sim in a full wetsuit, achieved by modifying the Seasons wetsuit and Island Paradise mask in S3PE to be available as Everyday outfits, combined with Everyday gloves and socks.

Female Sim in bikini in hot tub, Lucky Palms.

Various types of female swimwear, The Sims 4: Perfect Patio Stuff.

Woman in wetsuit playing with a dolphin, The Sims 4: Island Living.

Various Sims by the poolside, The Sims 4: High School Years.

Various swimwear, The Sims 4: Poolside Splash Kit.

The Sims Social promo image.