Esme Youth Comfortable Sleepwear Chemise XXS/14 XS/16 S/18 M/20 & L 6% spandex Esme size runs different than other brands, for this Junior Chemise, size S is around Adult Petite Size 0, please check the measurements below under Product Description. Most Comfortable & Super Soft; 47% Modal/47% Cotton/6% Spandex Soft pima / modal cotton. Breaths in cold and warm weather. Made in USA Machine wash in warm or cold water.