I wear a 2xl or a 3xl to acommodate my bust or shoulders if it is a fitted or buttoned blouse. Which to the best I knew was 18-20 1xl, 22-24 2xl , and then 26-28 3xl. so i ordered a 2x. I could not even put it on. my arms wouldnt even go all the way into the sleeves. so I am not sure if the shirt was maybe improperly marked, but I should have fit into the shirt, by the bust measurements. Furthermore, my friend who wears a LARGE has it now, and it is snug on her.