I mentioned my Winston tee shirt.. I got that in 1989. I have some suede Birkenstock's that are a little older. My Birkenstock's are every day. And, when the Winston shirt comes up in rotation, it gets worn.
The oldest article of clothing that I wear (and then only rarely) is an old pair of work pants which I use as paint pants.... and I bought them in 2015. Everything else has already hit the rag bag. I wear out clothes quickly (even those paint pants are now on the "indecent" side). Any old clothes that I didn't wear out I donate (I seem to have a habit of washing them in too hot of water and they shrink).