This is now true of blue jeans, even brand name Levi's as well as typical khaki dress pants. The leg seams twist. No conspiracy, just cheap material, cheap (and probably abused) labor, no quality control and low consumer expectations. The bright side is that all of this costs more too.
Please tell me you are joking about Levi. I used to swap through Wranglers, Lee, all sorts of other mystery brands, and every one of them, except for Levi, twisted so that the outer left leg seam turned towards the front. So, for the past few decades I have remained with Levi Strauss & Co. My two existing pairs are pretty old, approaching their perfect stage where the first genuine rips happen at the knees. How will I replace them?
The twisting warps happen now with all my T-shirts, and I conclude that it's because of parsimony, and using cuts of cloth simply to maximise output per roll of material, and not quality of garment. You can't cut against the natural bias and expect things to keep shape. Even the best roll of material will fail to meet requirements if you cut it badly. Corporate greed meets new generation of directors... the old sensibilties leave and drift from real to proclaimed, instead.
I won't even get into car design, where since the end of the seventies it has been almost impossible to find a car where you see the corners or even the nose and end of the tail. Of course, this is admitted by the sale of electronic parking devices to alert you to impending disaster instead of letting your own eyes play their rightful rĂ´le. My little Fiesta is almost impossible to park parallel to a kerb if you have to do it by reversing past another parked vehicle: the rear quarter rises and removes any sense of distance to either kerb or the car behind you. It's probably why they come with plastic front and rear ends. Of course, if you don't give a hoot about kerbing your alloys, then go for it and park by your own musical scrapes. The mirrors won't help: they don't really show enough of the wheels: I often think I am hitting the kerb, and when I get out, there's about four inches of space...
Hey, it's all about modern and progressive design!
Rob