I am 5'5, 125lbs, and ordered an extra small. It was not super blousey loose and fit well. It's longer in the back which I liked a lot and my favorite part was the extra fabric under the arm. It gave the great look without risking your bra showing (which was great for work). I ended up buying it!

Double Rainbow Top

Trina Turk

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Size Worn: XS

Usual Size: 2

Height: 5' 5"