I got a 2nd hand pair of bsps in a tag size 32 and the waist fits fine. i wear a 31 in dukes. 30 in apc. and the like i said, wasit is ok. in the tag size 32 flatheads. im sure it could stretch, but the thighs are a bit bigger on me. So if you think you can make the waist work, the thighs will probably be alright.
I'm not going to risk it. Since this is my first foray into raw denim I am going to go with a less expensive brand. I Just got a pair of APC's in the mail today but they are a bit too loose in the waist. I also have a pair of Naked & Famous Skinny Guys on the way. If I love raw denim and these work out well, then I will move up to the expensive Japanese denim for my next pair.