100% Rayon Breathable and Moisture Wicking Fabric, and is almost inelastic. Lightweight slip will provide comfort and a flattering fit! We suggest to choose size according to the bust size and weight two-way standard. Please check your measurements before ordering to make sure the item fits. SIZE----Chest Girth------Total length------Weight(KG/Pound) XL --------82 cm/32"---------72 cm/28.3"-------45-53 kg/99-117 lbs 2 XL -----87 cm/34.3"------74 cm/29"----------50-58 kg/110-127 lbs 3 XL------91 cm/35.8"------76 cm/30"----------55-63 kg/121-138 lbs 4 XL------96 cm/36.2"------78 cm/30.7"-------60-68 kg/132-149 lbs 6 XL------102 cm/40"------80 cm/31.4"--------65-70 kg/143-154 lbs Note: The sling length is not included in the total length of the pajama.