I'm guessing you're about 6'2"? 280 to 300 lbs or so?
I wear the same size. I think it's BS that it's ok to be short and fat but not tall and fat. Stay away from the big and fat stores. Their brands are crap.
Schmidts from Tractor Supply will last a long time but they are saggy as crap. Look like a baby with a full diaper hanging down in the back all the time.
The Faded Glory I've had have done a nice job.
And for whatever reason whatever 'rental pants' I've had from uniform suppliers at work (steel mill, trucking and construction) have worked well too.
BUT as of late, I've made the jump to cargo pants and haven't looked back.
If you don't HAVE to have jeans take a look at Proper uniform cargos and 5.11 uniform cargos. You can find them at
www.galls.com. The Propers fit right, have elastic in the waist band (they are a tactical pant) and are tough as nails. 5.11 is THE name in fire, police and EMS uniforms. Can't go wrong there either.
I have a pair of ripstop material Wrangler Cargo's I got from Wally World that are really nice.