Ohhh.. I'm excited for your story!
Good luck in recruitment, keep a positive attitude, and be careful about what you say here: it's easy to google info, but most people on GreekChat were able to narrow down your school to within 2 campuses from the first post
You might want to delay your update posts by a day or two.
As for dress, you could almost wear a sundress for the first 3 rounds of recruitment, just try to get progressively more formal, if you can. For this campus, as long as you look well put-together and feel great, that's what counts. Comfy shoes are a MUST.
For preference, go for a dress in darker or more vibrant colors (except for black) in cotton or another daytime fabric; avoid any shiny materials, satin, lycra, rhinestone embellishments, etc. If you feel really awesome in your outfit, then you're probably good to go.
xoxo,
lablondegphi