Lululemon charcoal gray zip-up size 8/10?

This is a charcoal gray zip up by Lululemon in a fitted style. It has black accents, and is in good used condition. The reason it is so inexpensive is because I am not positive of the size. My best guess is it fits like a size 8, but I know Lululemon runs small, so it might actually be a size 10.