Calvin Klein Underwear Signature Bikini in Red. - size S (also in ) Calvin Klein Underwear Signature Bikini in Red. - size S (also in ) Spandex blend. Hand wash cold. Elastic stretch fit. Lace trim. CKUD-WI67. QF1422. One of the most recognizable designer names in the world, Calvin Klein exudes signature sensuality and sexuality through classic styles and minimalist designs.