Size 1. I don't know. I never buy pants so I'm just trying stuff right now.
PS those nonnative pants are the fucking shit. Love them so much, pretty much perfect. Really like how big and puffy the top block is and then the heavy taper, and the material is better than I thought it'd be too. Also the slight drop crotch
Saw a pair of the same one on Yahoo Japan that I almost bought (in wool, and I don't think it was cropped) but I thought maybe it'd be overkill