This is how I operate with normal socks - I never buy a single pack of socks - I just do a "line change" and replace them all when the old rotation is too far gone to meet my needs.

I have a few specialty items for exercise or dirty yard work, but those are easy to separate from the daily drivers.

My sons still wear socks I bought for myself 22 years ago. They also wear my 40 year old wedding and funeral dress shoes. My feet grew, so I can't wear either.