The Duchess of Cambridge set foot on US soil wearing an elegant blue-grey dress by Roksanda Ilincic.
Another view of the Duchess.
The royals were welcomed at Los Angeles International Airport by dignitaries; among them, British Ambassador Sir Nigel Sheinwald, California Governor Jerry Brown, and Los Angeles Mayor Antonio Villaraigosa. 
In this image of the couple with Governor Brown and First Lady Ann Gust, you can see the detail work on the back of the dress. 
Kate and William’s first stop was a conference on venture capital and new media put on by Variety magazine.
Now for our look at what Kate wore. 
She was in the ‘Peridot’ dress by Roksanda Ilincic. With an enormous thank you to WKW Facebook pal Janice and AnnieElizabethN on Twitter, we are able to show you the dress at Matches Fashion, the two eagle eyes discovered the dress there almost immediately.
Here is how the dress is described at Matches Fashion:
“Light blue grey. Draped neck to one side. Cap sleeves. Pleats down from drape neck to waist band. Pleated skirt. White tulle neckline and cuff trim. Centre back pleats. Small pleated panels from back waist band. Exposed centre back zip. Beige grosgrain front tie.”
If still available, the dress is quite a bargain, currently reduced in price from £815 to £570. It is also available in other colorways, notably a rich turquoise, at other online sites, your best bet is to do a search for “Roksanda Ilincic Peridot dress”. This photo offers a better look at the delicate layers and draping at the neckline.
The designer is worn by many notables, including Michelle Obama and Gwyneth Paltrow. Born in Serbia and now London-based, Ms. Ilincic is described by the Telegraph as “Famous for her fluid, draped designs in dazzling, jewel-box colours…”.
Kate carried the LK Bennett Natalie Clutch again.
UPDATED 7.12.2011: The shoes are the “Lovely” style in the powder pink colorway. Jimmy Choo posted the following on their Facebook page today.
The ‘Lovely’ is not currently available in the Powder Pink worn by Kate, we show it in pink suede. 
The shoe has a 4.3″ heel (110 mm) and is available in Black Patent for $525.
It looked like she kept her Kiki McDonough Grace Earrings on from earlier today and also wore her Elsa Peretti® Diamonds by the Yard bracelet from Tiffany.
We will return tomorrow, the day holds a host of activities, from polo to the black-tie party tomorrow night.
Ashleigh
Friday 5th of August 2011
Where can I get this dress?
Jennifer
Tuesday 12th of July 2011
Just saw that the shoes are LOVELY in powder pink by Jimmy Choo. Also the shoes from Prince Edward Island. Confirmation by Jimmy Choo facebook page. http://www.facebook.com/JimmyChoo
RFM
Monday 11th of July 2011
Isn't it interesting that her pink shoes match the ribbon on the dress as shown in the Matches Fashion picture, even though she didn't wear the ribbon? Perfect dress for her.
rcmisty72
Sunday 10th of July 2011
Just for your information, Canada is also an American soil!!
Lucy Costello
Sunday 10th of July 2011
I believe these are Jimmy Choo shoes from the Sping 2011 collection, unfortunately they appear to have sold out online and I cannot get a link to the shoes that I believe they are. If I find it, I will post it on here! Such a timeless and classic dress sense she has!! It is not so much high fashion but will last over the years and there will still be people wearing these types of outfits in years to come. Love it! (also love the fact she recycles outfits, rather than a one-wear-wonder like many celebs are nowadays! It makes it feel more accessible to the average person!)