I've always believed that the pants are almost meaningless, it's the shirts that need to be different daily.
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.