If you are like me and your shoulders are broader than your hips, the boat-neck on this won't be too wide on you.
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i am normally a m or l in retailer tops, and went with the m, and i have very large biceps. if you're broad-shouldered but have smaller arms, i would recommended sizing down a size.
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i have a very long torso and didn't find this to be too short...but i love jeans with a 10" rise. if you are going to pair this with low or medium (8.5") rise jeans, then yes, you will