This may be a bit of an excessive example, but it still applies: stick with a classic US Navy Peacoat (or one designed similarly) if you want a hardy, long-lasting wool coat. While Burberry is a phenomenal brand that makes wonderful coats, their prices are far too high for the common man, especially when the Navy offerings are made to be used and abused. Just like the M65, check out army/navy supply stores online for new/used peacoats, and expect to have to have whatever you purchase tailored.
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Gap products go on sale so often for a reason. They have a half-life of approximately 8 months. If you buy 8 gap shirts, you can expect to have 7 decay after 2 years of gentle use. They still make a profit at $5 a shirt; that ought to tell you something about the quality of the material and workmanship.
That said; AmAp, despite being made in the good ol’ USA, is also remarkably low quality.