There is little consistency in sizing. One manufacturers L is another 2XL. Measurements and sizing charts are your friends. And what one store calls a 5 another says is certainly a 6 or a 4. Styles and materials can also change fit a lot. Buy one to test fit then several if you are happy. Dresses are even crazier. My closet ranges from 14w, 16, 16T, 18, 20, 22, L, XL, XXL & 3XL that all fit well. There is are discards a plenty in all the same sizes that fail to fit in some way or another. There is no substitute for trying stuff on.