Heh, thanks for all the comments! I have no idea how many accidents I may or may not have caused, but I do know that the bike + dress combo has definitely gotten me compliments at least once an hour on the trails!
Winnielou, that's an aluminum frame Era. With the tubeless wheels, it's weighs in around 25 pounds.
Kerry, the dress is from Castelli, it cost me a small fortune but was worth every penny. Looks like TE now has the new version with elastic on the waist and a more A-line skirt shape: http://www.teamestrogen.com/prodCI_L10119.html
I was drooling over the Terry skorts and wrappers for a while, too, but I eventually discovered that you could hit up a trendy teenybooper store and pick up crazy miniskirts with elastic waists for cheap that are about the same length as the bike shorts inseam.

-- gnat! (and socks: socks are very important)
Windsor: 2010 S-Works Ruby
Pantysgawn: 2011 S-Works Stumpjumper 29er
Whiz!: 2013 S-Works Crux (Singlespeed)
Boucheron: 2009 S-Works Tricross
Haloumi: 2013 Tern P7i
Kraft: 2009 Singlecross
Gouda: 2005 Electra Betty
Roquefort: 1974 Stella SX-73