The pants are still sized by inch in waist size if I'm reading the site correctly?
I wear 32X34 Carhartts and jeans. That's what I ordered, and they fit me perfect. Only thing I've ever layered under them is 185 wt merino, which isn't much. I got mine in 2011, and have heard lots of complaints about sizing since then. It might pay to order two sizes and send back the ones that don't fit.
For jackets, I went with medium originally and sent them back for large. I'm 6'1 and 170 if that helps.
