With classic styles and well made clothing, this is absolutely top notch and smart advice. Burberry trenches are so well made that they will last for decades - literally. My dad got his most recent one in the early 1980s in London and it is still in fantastic condition from daily wear. My parents bought me one for college graduation 21 years ago. Full length, top of the line trench with the removable liner for winter/summer use. It is so classic that it will never go out of style. With that said, I hardly ever wear it because I work from home. :P
Maybe there is a quality difference now, or maybe some of you have bought lower end stuff, but the top of the line Burberry from the 1970s, 1980s, and 1990s is excellent. The stitching and fabrics are fantastic and they wear extremely well. Cheap stuff will fray and begin to wear out quickly from daily use.
Suits, jackets, sport coats, things like this are all over the place second hand. Estate sales, Ebay, consignment shops...