Bought this for my brother's wedding and i just received it. i ordered my usual size xs. it's a tightly woven knit, with little to no stretch in it. i could barely get it over my head and my arms could barely fit in the sleeves. and i don't have big arms at all. for reference, i'm pushing 5'7", around 125 lbs. i'm glad it's so structured because i was worried that it would lose it's shape with this material make-up. but, no. it's really fitted. alas, i need to try again with the next size up. ma