In reply to GUNTER: You might be OK, I've found RAB to favour slimmer chests/shoulders than me. I think I'm 40 or 41 in the chest but I'm just under 5'10. RAB's medium is a bit tight over my chest in non-stretch fabrics, but large too long on sleeves/body etc. I like my Shadow hoody's fit in medium but that is very stretchy.