If you're very small-framed and/or petite, i would size down in this. unless you want a really slouchy look and fit. 
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i have very broad shoulders and very large biceps, and typically wear a m/l in retailer tops. sometimes if a top is a pullover style (as opposed to button-down) i have to size up to a 12 to get the top to accommodate my shoulder width and biceps. so i was leery the size 8/italian 44 would fit, but it does, with room to spare, albeit it is not as loose or long in the ar