A men's swimsuit that includes an outer shell having an outer-shell waistband; and an inner liner that defines an interior lumen. The inner liner includes an inner-liner waistband attached to the outer-shell waistband; and a pair of inner-liner leg sleeves extending from the inner-liner waistband. Each inner-liner leg sleeve terminates in a hem configured to exert a radially compressive force urging the hem against a thigh passing therethrough. As a result, the hems of the inner-liner leg sleeves, in cooperation with the inner-liner waistband, prevent particulate matter from reaching the interior lumen of the inner liner.