Gilligan O Malley Pajamas Set Size large Lightweight, Tencel fabric ( see notes) Top: Chest measures 22" underarm to underarm Length from shoulder measures 26" Pants Waist measures 17" laying flat Inseam measures 31" Tencel is a sustainable fabric, regenerated from wood cellulose. It is similar in hand to rayon and bamboo, both regenerated fabrics. However, Tencel is one of the most environmentally friendly regenerated fabrics, for several reasons. Tencel fibers are grown sustainably.