Of course jacket sizing depends on the jacket but generally 40US. For the PS coat a 3 worked for me as it has a bit of room. Good luck!I think I saw Simon indicate on some comment reply in the website that the price difference was because some official charge (sorry i can't remember what) was baked in to the private white as shown before checkout that would get baked in to the ps price after checkout and that they should come out the same. I have not even tried to fact check it, seems like it should be easy to though.
Mind if I ask where you are at on jacket size and where you ended up on ps coat sizing?