I’m 5 8 1/2 and about 150 lbs and you can see the jacket is just a little too tight in the chest and sleeves are borderline. It’s a size 18 and still in great condition. Perfect for bigger sized boy or smaller sized man. I know this is a bigger investment & blazers can be tricky to buy online so If it doesnt fit when you try it on in person - no worries mail it back & I’ll give you a full refund :)