I purchased the medium based on measurements of other medium jackets I own and from reviews and all the sizing info on Ironhear etc. I'm a 38-inch chest size, 72kg, 5'10'' tall and 18.5-inch shoulders and the jacket almost fits me perfectly except the shoulders. The shoulders on the N1 jacket are at least 1 to 2 inches narrower than every other jacket I own in a medium. The arm length, the chest size and the opening are all perfect but if a layer, it is quite tight in the shoulder and under the arm. I maybe should've gone for a large, but from what I've read in reviews, the chest might be a bit baggy in the large and the arms too long. I guess the N1 is going for a trim silhouette, but I wish they had gone a bit wider in the shoulders. Anybody else had an issue with this?