Crafted from a high-stretch blend with cotton and modal, this pyjama set sits casual against the body with a button-through shirt and elasticated waist shorts. Shirt and shorts set. High-stretch cotton jersey. Chest pocket. Button-front closure. Elasticated waistband. Branded patch to waistban. Calvin Klein Underwear, curated by Reiss, is a collection of lingerie designed to elevate the underwear drawer and work perfectly beneath your existing Reiss garments. Feel comfortable from the first layer.