I'm always taking note of who wore what, and this came courtesy of the great Whitney Balliett.  Only trouble is, he doesn't go into any detail, only noting that, somewhat like Woody Allen, Hammond (who came from a well-off, WASPy family) carried on dressing like a college kid (rather than switching to tweed jackets and wingtips as he grew older?). 
A great name not only in jazz (promoter and critic) but also civil liberties.