Let's face it: If you're one of those sedentary audiophilic types or you have a genetic disposition to growing pear-shaped later in life (genetic . . . right, that's it: nothing to do with couches or hooch), it's wise to adjust your fashion sense accordingly. And nothing says "portly gentleman in disguise" like a guayaberaa shirt that, I have just discovered, blues guitarist Bob Margolin and I both love. He even wears one on the cover of his new record, My Road.