If it helps, they go up to a size 38 which is labeled "XL" but they do run small. I've got clothes from this exact same company only I bought them through a Disney store with the prices jacked about 10 times the amounts here. There is a sizing chart, but Chinese clothing is very clingy around the shoulders; if you're broad or have boobs at all, go larger.

What I do with Chinese clothes is I go larger if the sleeves are long--because my arms are ridiculously, stupidly long--and then I take in the waist and hips myself. Kind of a bother but the clothes are so cheap it makes it easy to expend a little energy. ;)