Julius seems to be sizes smaller than ROs. Chest measurement on the Julius size 1 ranges from 16"-17", I'm usually wear 19" or 18" if I want to push it and the leather are softer like washed or blistered lamb. Most people I asked suggests that I am probably a size 2 in Julius. Yeah most Julius leathers fit small, gotta have a slim frame to fit into them. That particular Julius x Gordini leather has a 18" chest though.