i am 5'10" 198lbs and i ordered a large. i wear large t-shirts and most of my other sweaters are larges. this sweater fit me like it's an extra large. it works but is far from fitting properly. It's loose but fine around the chest and the sleeves are too long and drape over my hands. the sweater is comfy and i love the colour and pattern. but one other grievance i have is that its only been a week or two and there is already fraying at the ends of the sleeves and every little scrap of lint is sticking to the zipper seem. it doesn't maintain a sharp look for long without constantly fussing over it.