I don't know why all these people are reviewing Dickies saying they run small. Run a tape around your waist (just below your navel) note that measurement, then order that size in Dickies. I'll bet you they will fit. Don't go by what size you wear in other brands - every brand sizes differently.
Dickies is the only brand I've come across that actually sizes their pants "true" - that is, if your waist measures 38", then order a 38. I wear a lot of Gap and Banana Republic pants too, but they run a size large (a 36 size actually fits guys whose waist measures 38" - this is called "vanity sizing"). Most other brands do this as well, it makes us consumers feel better, i.e. "I'm only a 32, not a 34 in Gap pants". I also purchased shorts from DC and Burnside in this order and they are labelled a size smaller than these Dickies - however all the shorts fit.

Also, if you're not familiar with Dickies they are pretty stiff right off the shelf, give them a wash and dry and they'll be ready to wear, and will soften up after a few more washes. Very rugged pair of shorts that fits just below the knee. Would buy again.