LesetWomen's Pointelle Short Sleeve Tee

I ordered my regular xsmall. The top they sent me hardly fit over my head, I could not put it on! This is for children, why did you sent this to me? Now I have to return the item and have no clue what size to order. Is large going to fit? I do not need this hassle, will not re order anything from this brand. Why don't manufacturers have mannequins for every size in the factory and check if the clothing they produce actually fits?!