"Open in case of . . . "

Hey everyone!

Just curious about something.  Okay, here's the scenario - you're working madly on a big project in your office, but it's a no-one's-gonna-really-see-me kinda afternoon, so you're just in something really casual . . . and suddenly, you're invited out to dinner with friends - And you're wearing a t-shirt with jeans. 

Other than the basics (toothbrush, fragrance, etc.), do you keep emergency clothes at the office?  Ladies, is there a pair of 3 inch black heels tucked away in the drawer in case of a last minute cocktail invitation?  Guys, is there an extra blazer hanging behind the door? 

For me, thank heavens for the "crisis" cashmere turtleneck and English loafers.   Am I alone with this?