One princess-worthy dress
[Marios Schwab for Halston, Spring 2010;
approximation, $895 at Bergdorf Goodman]
+

One functional jacket with pockets for essentials
[Combat field jacket with liner,
$49.95 at Uncle Sam's]

+
One pair of sensible shoes, to swap for your heels
[Lacer work boots, $124.99 at Georgiaboot.com]
+
Your portable beverage of choice*
[photo by fredabercrombie via flickr]
+
A good supply of matches, for the campfire
[via the matchbook registry]
=
Prom night, Northern Idaho style.

*Just by way of example. Flat Earth does not endorse underage drinking.