To wear these bikini bottoms, simply wrap them around your hips and tie the crossbody detail as tight or loose as you like for a comfortable fit. When it comes to taking care of them, rinse them with fresh water after each use to get rid of salt and sand. Don't use harsh detergents, just a mild one and wash them by hand. Hang them to dry in the shade, not in direct sunlight as it can fade the satin fabric. As for sizing, they run true to size, so you can pick your regular size. Also, since they have skimpy coverage, keep that in mind if you're more conservative. Have fun at the beach or pool with these stylish bikini bottoms!