I’m surprised it took this long for anyone to mention Barbell Apparel. It certainly depends on your preference for appearance (guess they’re just not flip’s “style”) and how much you’re willing to pay, but I’ve bought four pair over the past 2-3 years, wearing one of them basically every day and all are holding up well. I second antiquity’s comment that the stretch is so good, you could do a squat workout in them; they’re the lightest, most comfortable jeans I’ve ever had by a good margin (when I bought my first pair and then wore a pair of American Eagle the next day, the AE felt so uncomfortable in comparison). Price point is high, but I’ve had the “crotch wears out with 6 months of regular wear” problem with all previous jeans since I started lifting heavy enough to have bigger legs. YMMV.
I’ve heard about Barbell Apparel a few times and will have to check them out. I’ve always had big(ger) legs (not “lifter big” but “normal big”) and as I keep on squatting it’s only going to get worse.
At least, I hope so.