Griffin Post wrote a review of Black Diamond Couloir Harness on May 30, 2014
Familiarity: I've put it through the wringer
This is a great minimalist harness for ski mountaineering. It doesn't take up a ton of room in your pack and you can put in on without taking off your skis. Nice. Sizing can be a little funky, having a 32in waist (yet putting it on over my ski clothes) i felt like i fell a bit between sizes. I went with the S/M, and it works pretty well, but not sure how well it would work over a large puffy. That said, it sounds like those went with the larger size also had issues. If you think you fall between sizes, i'd order two and return one.