I have two pair of these now.  The first, following the sizing chart, my regular size, and ignoring the other reviews, I ordered a 6.  Yep, way too big.  Thankfully, with long underwear bottoms above the waist, a shirt tucked in and a belt they'll work just fine for long cold days.  The second pair is a 4, and aside from a small (crack-free) gap in the back when I sit, they're perfect.  The mid-rise is significantly more comfortable than my similar high waisted Carhartts.

The fabric is soft and durable, I love the scuff guard, and the deep pockets and loops have made me more efficient now that I'm not running back and forth picking up tools and such I set down somewhere else.

With the black pair, after two seconds in the barn, I look like Pig Pen; but that is what black does, and it brushes off easily anyway.