This happens so much
As a woman I can tell you that sizing is completely out the window these days! I can be one size in one store and 3 sizes smaller or larger in another. There is no consistency in women's clothing sizes and it can be utterly demoralizing when you try to shop.
It also makes online shopping next to impossible because you never know what size to order. One teenager is making waves after calling out popular store American Eagle Outfitters after she claims she bought two pairs of shorts in drastically different sizes.