- Navy cotton-jersey - Elasticated drawstring waistband, on-seam pockets, embroidered designer emblem - 100% cotton - Machine wash - Polo Ralph Lauren 's loungewear is made with the same care and consideration that's applied across its ready-to-wear line. Embroidered with the brand's emblem, these navy pyjama trousers are cut from smooth cotton-jersey for a comfortable fit. Wear them with the matching tee to guarantee a restorative night's sleep.