Pair of Nike canvas plimsolls. Bought them soon after getting my first job as a teen back in roughly 1997. They get occassional use and are freshened up with a brand new pair of spanking white laces.
Am now a person who only buys clothes if current stuff is wearing out. When it does get too tatty, it is used for gardening or DIY where it may get ripped or trashed anyway.
Looking at my wardrobe, I see there is nothing other than socks that I've bought in the past 3-4 years or so.