Dress Pants Conundrum

I've recently decided to seriously pursue squatting 525. It's going well. I can squat 420ish. I'm 6'2 245. Gained roughly 30lbs this year. Currently floating around 18% body fat. Long story short, my thighs and butt have exploded. I've always been relatively fit. I'm an ex college athlete. I've never had a gut. Still don't really.

The thighs of my 40w & 42w dress pants no longer fit. The waists are still super loose on them. I have a management level job where dressing up is required.

I need to upgrade my wardrobe to accommodate the growth. What brands should I look for? I've spent $250 on a pair of great pants. Worth every penny imo. Looking for advice of where to look, or if I just need to start getting things tailored? But they can't make my thighs bigger.

It's causing me headaches for sure. I'm still 100lbs out from my goal, so the gains are far from over.

HELP ME PLEASE

(Yeah I have an office job. No squatting 525 won't make me better at my job. I'm still gonna do it.)