Seconded on going a couple inches up. I wear a 32 and got 32s, and while they fit great, they're a little tight for IWB carry. I plan on getting another pair slightly larger in a different color.. They're definitely nice pants for the money.
I have a few pairs including one in multicam. Agree on upsizing the waist, especially in MC as I found that pair to be sized a bit different than the olive and tan ones. The MC ones I have are cut a little bit different than the colored ones. I am a 35/35 x 33 and the 36/34 Vertx fits well. Sizing aside, great pants, really comfortable.
Swage. I don't have any MC pants but on the other colors I actually went up 2 inches in the waist. There is about an inch worth of elastic play in the waist so they are very comfortable when wearing IWB and not to loose when I'm carrying OWB.