Well, I own several pairs of those, and find them very comfy to ride. Dunno about the fashionability - as I am 36, married, and probably a foot taller, a foot wider, and 100lbs heavier than most people on here.
They do have seams in the crotch, but they are flat, and there is a gusset of sorts, which makes them ok on a saddle. They are cut a bit higher in the back normally, and have a fairly low rise for being loose fitting.
I do usually wear padded lycra shorts under my "tactical capris". I've ridden plenty in jeans too - but anything longer than a few blocks to get beer gets a bit uncomfortable for me, plus it exposes my sexy derriere - which sucks in cold weather. And jeans SUCK in wet weather in general. These seem to dry fairly quickly for cotton, and the fabric has a rip-stop weave. They literally are short BDU's.
I also like riding in cutoff Dickie's, Ben Davis, and in some pegged and hemmed western Levi's slacks I got at a cowboy store.
