Looking for work solid pants
I've been looking for good, lasting work pants for a while. Specifically they need to be solid black without outer cargo pockets, and my big issues have constantly been that every pair I try is tight in the thighs and crotch or the crotch seam just blows out. The work can be hot, decent amount of time both outdoors and in buildings with no HVAC in a place that's used to 100+ temps, so breathability would be nice, lots of walking and sitting, some kneeling and crouching. I know it typically goes without saying but also needs to have belt loops, uniform reqs call for a belt specifically.
I'd like to not spend a fortune on them, but I know quality costs and I've already spent half a fortune trying brands that don't work.
Size 42 waist, 29 length, for reference I'm about 315lbs and 6ft tall.