Wash less, and wash cold when you do. Turn a shirt inside out. Skip the dryer for linen and wool; heat is what shortens a cloth. A steamer, or a damp cloth and a press, is enough for a collar that needs to look decided.
Repair is part of the same idea. A loose button, a hem that has walked, a small hole at a pocket — those are fixes, not reasons to retire a piece. A garment that can be mended is the one worth buying.