IIRC you are 6 footish and 270, 42/44 sized belt.
My first shooting mentor (DRS/RIP) was 6 footish. When I met him in 1989, he was 250ish. when his diabetes and other stuff kicked up, he went up to 365. When he had gastro surgery, he came down to 200ish and then when his kidneys slowly went, he got down to 165ish which he had not been since he finished Ranger School in the 70's. He was a PITA. I loved him like an uncle. But he could always shoot, any platform, at any weight, and particularly ran a pump shotgun like a house of fire.
He trained with and carried everything (pistolwise) from 5 inch 1911s, to Hi-Powers, to 3rd Gen S&W pistols, to 4 inch XDs, to a Glock 19 (finally!) mostly in Tier One leather makers of the day to include Kramer, Sparks, Andy Artoonian and Null, mostly OWB.
His go to belt over his whole shooting life (Multiple Gunsite classes, Multiple Thunder Ranch classes, Multiple Rangemaster classes, Range Officer at IPSC National Matches, Early IDPA matches etc. was a WILDERNESS 5 STITCH BELT. And sometimes, particularly in his bigger days, he used a set of Perry Suspenders too.
https://www.amazon.com/Perry-Suspend...50733302&psc=1
For the love of all that is holy, buy a MF 5 STITCH WILDERNESS BELT AND START DOING THE WORK.
PS-To parphrase Clint Smith- carrying a gun is not always going to be comfortable, but it should be comforting. As sure as the day is long, if you are do-dicking around with off body carry, cargo pant carry, truck magnet carry and back again, it is just a matter of time before you forget the gun in the cab of your truck, or get it taken away from you because somebody sees it and /or sees you moving it around when it should be in a quality OWB holster whose belt loops i.e. 1.5 inches are threaded by a 1.5 inch 5 STITCH WILDERNESS BELT.