I finally got my SkG Black Power Stretch and was able to try them on so I thought i'd give a follow up on how they fit. Hopefully this info will be helpful for someone trying to find their own fit. I got a tag size 30 (actual waist measures 31 on blueowl) and right out of the box, they fit quite perfectly skinny, so I'm guessing I went TTS for this one. Not painted on skin tight, but not loose either. My actual waist/hip measures about 30"-30.5". I was initially worried about the waist being too big but to my surprise they actually snug but will probably stretch enough where I will need a belt. They fit tight throughout thighs and legs where the loosest area would probably be the crotch/top thigh. The leg opening, although around 15" should stack nicely. I'm planning on hemming it to a 32/33 inseam so hopefully that won't affect leg opening size too much.
For reference on my proportions; I'm about 5'7 and currently weigh 125lbs. For an idea of how they look, the fit looks very similar to the fit pics on Blueowl. If anyone wants actual fit pics feel free to ask.
calves: 14" - 14.5"