try google images: behomian and bohemian chic... you'll get some good results...
boho is like artsy/woodsy kind of style... one of the really prominent is the "hippy" hair like this: link
Think like interesting patterns, wood accessories and long flowy hair... nothing tight... everything is "free". probably a skirt if you're not gonna wear jeans, or leggings under a long flowy top... :)
Good luck and have fun! should be interesting to see everyone dressed like that... :)
"Boho" is an oddly chosen abbreviation for Bohemian, and a Bohemian is someone probably most easily invisioned (for the sake of brevity) today as a Hippy or Gypsy. Go to Google and search any of these aformentioned types of people and select your clothing options accordingly.
What Girls Said 1
Think Sienna Miller. Do a google search on her. I'm surprised that this would be the dress code, because it is going out of style. Anyway, anything that doesn't look corporate or neat should work.