Fashion will try to sell you a new personality every quarter. Ignore most of it. Underneath the rotation sits a short list of pieces that have survived every season for a decade, not because they are exciting, but because they never stop being useful.
A white shirt with no logo. A dark, straight pair of trousers. A jacket that fits the shoulders exactly. Leather shoes that can be resoled. A plain watch. One bag that carries a day without complaining.
Buy once, buy well, and let the years do the styling.
The test of a staple is a photograph from five years ago. If the outfit still looks like you, it passed. Everything else was a costume you rented from a trend.