I did check out Matt's blog and the Aug 15 lead entry is indeed related to the issue I raised. So all credit to Matt (and again, to Charles for pointing this out to me). Although Matt does not menton the POW check suit of Goldfinger fame, he does mention the difference between book and film Bonds. In this connection, although obvious, it is worth pointing out that in the very visual film medium, Bond's clothes are far more salient on a frame by frame basis, compared to the written narrative of the books, where his clothes are mentioned but then the narrative moves on. This visual salience may have led the wardrobe designers for the films to pay closer attention to what Bond was wearing in each scene and episode, and how that related to the impact of the scene.
One other possibility that occurred to me as I read through the blog: Perhaps Fleming often specified tropical worsted for Bond because he himself would have felt more comfortable in this material. Fleming generally wore half-sleeve shirts with his suits, so perhaps he had less tolerance for clothes that were warmer, like a flannel suit. And as Matt himself mentions somewhere (I think) in a different blog entry, Fleming dressed Bond pretty much the way he dressed himself, except for the black silk knitted tie replacing his own bow ties.