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I'd also add the askandyaboutclothes.com forums.

Wow that domain name took me about 20 seconds to parse :/

for one of Alan Flusser's excellent books on the matter

Particularly Flusser's "Style and the Man" and "Dressing the Man". I can't upvote you enough, he literally wrote the book on men's fashion.

The main problem with this article is it doesn't stress proportion nearly enough. Proportion/fit trumps all.