Skip your grandma's skirted swimwear and go straight for shorts! They'll cover up what you'd like to keep hidden while giving your suit an athletic twist. Not really a fan? Another great option is high-waisted. Just do a squat test before buying to avoid any unpleasant, um, riding up.
Opt for an Old Hollywood vibe with the Gap High-Waist Bikini Bottom ($35, originally $40).