I know women's feet often change sizes with pregnancy, so I'm not surprised it can happen to dudes who gain or lose a lot of weight. My secretary went up a shoe size with her last pregnancy, and suddenly found herself unable to wear a good chunk of her fabulous size 6 shoe wardrobe. My wife is a 6, so she was the lucky recipient of about $10,000 worth of barely worn Louboutin, Fendi, and Chanel shoes.
Moral of the story: be nice to your secretary and compliment her style. Her husband may be a lot richer than you, and the local consignment shop's loss may be your wife's gain.