As someone who went through colony recruitment, business casual would be best. Like Titchou said, a nice skirt or paints with a pretty blouse would be nice.
Looking SUPER quickly but here's just a few things I found:
http://www.nyandcompany.com/nyco/pro...k-Sheath-Dress
http://www.nyandcompany.com/nyco/pro...-Check-Pattern
http://www.nyandcompany.com/nyco/pro...stripe-Average
http://www.express.com/ruffled-ragla...ow/3/index.pro (blouse only, not the whole outfit)
http://www.express.com/the-original-...ow/3/index.pro
Nice jeans and cute top are more appropriate for the other days where you might mingle with other PNMs.