So a bit of a bone to pick with retailer. i am normally a petite xs (32b chest). however the petite sizing was not available online so i ordered a regular xs thinking i could always have it altered. i could barely button across the chest. huh?! when i went to return it at the store, i noticed they had xs petite on the rack so decided to try it. it fits perfect - like how it should! i can button fine across the chest and there is a little extra room.

i have no idea why the sizing is so off between