Sizing is off. Some people say it runs small but I would have to 100% disagree. I got an XS and it fits like a Medium. I’m a size 0 so an XS should fit perfectly. The boot covers fit my legs great so I would agree with those running small since my calves have a 12” circumference and that’s pretty small. Basically, I went to get it tailored and if you’re a true XS, it probably won’t fit. Look for a girls Supergirl costume.