So I used to have 8 pairs of pants, 2 colours total. Black and beige. Then, once a year, I'd go buy 2 more pairs of each colour. On a 'bad' year, I'd buy 4 pairs. EG, I'd rotate the worn out, always only having 8 pairs.
This persisted until, 20 years later, the company that sold them went bankrupt. As my gut and ass had literally grown to into the form / shape of these pants, drooping and expanding to perfectly fill these specific pants, no other pants I tried seemed even remotely comfortable. Or to even fit well!
So I tried to find the company that made them... note, this was very early internet, and I had to go old-school. Finally called the trustees handling the bankruptcy, eventually found out where the pants were made, called them, and?
It was in Mexico, and they made custom for a variety of retailers. And none were left, no matter how I begged.
Two things:
1) Don't wear the same pants for 20-30 years, while you gain your middle-age gut and ass. Just don't.
2) Always have a pants fallback plan.
> As my gut and ass had literally grown to into the form / shape of these pants
It sounds a lot like you are wearing clothes that are too small for you :)
Regardless, I would be very surprised if there were no equivalent. There are even many brands dedicated to reproduce old garments (off the top of my head, TCB denim does that for jeans)
I'm 60 and absolutely fine with the same sizes and basically the same cuts that I've worn for more than 40 years. If something starts squeezing, it's a timely reminder that I need to adjust some behaviour, not a signal to give in and upscale my wardrobe.
The problem isn't the pants, its your lack of fitness. You act like becoming overweight in middle-age is an acceptable thing.
Male fashion is on something like a 10 years cycle and you can find tons of brands focusing on quality or durability.
Female fashion seems to obsess about the latest trend and change dramatically every 3-months to a year.
Probably lots of cultural bias there, not sure how much this applies in all countries.
I kinda hope that fast fashion is not what's going to survive, between ecology and employment practices, they are not really my favorite.