Special Fabric: Silk satin polyester, which allows the skin to breathe naturally. Light, Soft, Comfy, Silky and Shiny. Size: X-Small=US 8(US 5-6 Years); Small=US 10(US 6-8 Years); Medium=US 12(US 8-11 Years); Large=US 14(US 11-13 Years); X-Large=US 16(US 13-15 Years). Design: Button down shirt, short sleeve, with shorts, super casual sets, chest pocket, lapel collar, matching with a long pajama pants and shorts, elastic waistband, casual loose fit. OCCASION: Breathable and lightweight button down shirt ensures maximum comfort throughout the night, Perfect for bedtime, sleepovers, and cozy evenings at home. The children satin sleepwear sets is perfect for daily wearing, sleeping, playing, bathing and lounging indoor and outdoor. Best gifts for daughter, son, granddaughter, grandson, close friends, ect as birthday gift, Christmas gift and other present. Washing: Please wash separately to avoid fading and dyeing. No bleaching, no fading, hand wash recommended. Hand wash gently can slow down the process of wear down or stiffen up; Not easy to be deformed or got faded. After cleaning, please hang it to dry and do not expose in the sunshine.