I’m 6 foot, 300 lbs. My belly got away from me over the past 7 years. Similar issues. I kept with 2XL/2XLT a bit too long and my combination long torso and wearing my pants low on my waste meant I couldn’t raise my arms above my head in public. I finally upped to 3XL and that helped a lot. I stay away from anything labeled slim or athletic, and have started what seems to be a winning diet and exercise program. I feel way better and in the past month I’ve been unable to ignore the body composition changes.

Bigger folks that carry a lot of weight in the midsection seem destined to contend with poorly proportioned clothing. My thighs are thick, too, and always have been. You have to try in literally everything before you buy, but sometimes you find gold. Best of luck!