My daughter tried on the xs in women's...
My daughter tried on the xs in women's Osolita and it fit her with room to grow, what size in the girls would I want to order for her. She likes the colors in the girls better.
Xs in women's is the equivalent of a large in girls, With the exception of the waist being bigger and the sleeves being much shorter. And don't forget to look at the sizing chart right below the select options drop down tab.