When i ordered this dress/tunic, i was unsure and pessimistic about it actually being one size fits all type of a deal,like for a none asian body type girl,due to asian size charts being different,meanins much smaller, than US or european size charts. The product listed the size as "one size". I thought that it might be to small,due to asian meaning of "one size",but decided to take a chance and just order it lol I am 150,at 5'6,and this dress fits me great, and even if i was an extra 20 pounds +, i think it would still fit good,because it has some stretch to it,and isn't too tight to start with,but at the same time fits well and looks good. So looks like "one size" actually works for girls around my size and up,which i didn't think would happen :) Go for it ;)