Reiss
Beige skirt - Its an essential piece, Kate could match this with anything, dress it up or down as well.
Blue dress - Great for an official event, its also a color that is outstanding, not too bright not too dark.
Silk bronze dress - A simple dress and a great color, hair pulled back and earrings kept simple, Kate would look lovely in this.
Pink/purple dress - Not sure what I would call this color but it's a great piece for any daytime event, it could be worn sleeveless or with a nice cardigan. The detailing makes it elegant IMO.
White dress - A lovely dress for a daytime event, I would love to see her in this with colored accessories to add color to it.
Blush top - Essential top to be matched with pants or a skirt, dress it up or down IMO is quite easy.
Black/white/beige top - I'd love to see this matched with a skirt, its not colorful nor is it too much blocks of colors. Matched with a plain beige/black skirt this would look really pretty.
Jenny Packham Spring 2011 (Jenny is a British designer known for her cocktail & evening looks)
All images from Jenny Packham - Luxury Design House. Bridal and Ready to Wear Dresses
Cocktail dress - Such a nice dress for Kate, she could pull this off very well but hair has to be pulled up.
Long blue dress - I like the fitted part of the dress around the wait and the cut. Its anise color and the embellishments on the front add a nice finishing.
Orange dress - The cut is lovely, the one shoulder style will suit Kate. The dress has a great movement to it IMO.
Beaded cocktail dress - Amazing dress IMO for a cocktail party or a dinner. The only thing with this dress Kate has to do is get the shoes and hair right.
Long beaded dress - I like the one shoulder of it, would be nice maybe with a very simple brooch in the hair.