The phrase "side cutouts" refers to openings or holes on the sides of something, usually to make it look more stylish or to allow air to flow through. Full definition
Brief bikini set features a pull - on style bikini top with back strappy and slide - hook closure, as well as matching moderate fit bottoms with side cutout details. (zaful.com)
Chic high cut bikini set features a bandeau bikini top with detachable halter straps and smocked overlay on the bust, as well as matching high waisted palm leaf swim bottoms with side cutout details. (zaful.com)
Solid hued ankle boots featuring side cutouts with velcro closure, a low block heel, and a rounded toe. (pinkblushmaternity.com)