Possible Clues:

• Olympic swimmer's wear, perhaps
• Big name in tight trunks
• Brand endorsed by Missy Franklin
• Swimwear brand with a boomerang logo
• Name on some suits
• Sportswear company which sponsors Nathan Adrian and Missy Franklin
• Beach getup, perhaps
• Swimsuit company that sponsors Nathan Adrian
• Swim meet garment
• Race round, part of a dash