I ordered a large due to the comments about the sleeves being tight in the bicep area. The sleeves are a little long, but I am 5'7". The sleeves fit perfect around my biceps, so it is a good thing I am not a very muscular guy. Overall, I love this jacket and it is a perfect addition to my Marty McFly costume.Let me just start off by saying, Back To The Future is one of my favorite movies of all time and having a screen accurate Marty McFly denim jacket is something I've always wanted but could never find. So you can imagine my excitement when I found this. Unfortunately, there is a bit of a sizing issue. If you are ordering this for a child or someone with a muscle deficiency, then this product is perfect for you. If you're an adult male, like me, not so much. I ordered this in a large and if we go based on the waist and chest, it's about right. However, the sleeves fit more like they would if this were made for a child. They are way too small and a little to long. The coat itself is very nice and pretty accurate to the movie version. The sizing is just way off. I might take this to a tailor to have a look at it, but I doubt they can do anything about it.Bought this jacket for my 13 year old son for him to be Marty Mcfly for Halloween! Jacket looks great and is quality materials. The only thing you should consider is that although it 'fit as expected' if you are in any doubt of which size to buy, I'd go up 1 size since the sleeves are a little tight around the biceps and forearms.Great replica jacket!!