I wasn't able to find a dress in the same color she's wearing, but I did find a couple options that might work. The first is from Alternative Apparel and retails for $40 - click HERE to purchase. The second is from Asos and is on sale for $20.29, click on the photo for more information.
Kelly paired her simple dress with an Hermes bag. Bag Haus has a similar black bag for $72 and you can click here to purchase.
Her shoes exact are by Bottega Veneta, which retailed for $199.95 at DSW (now sold out). I found a pair of t strap sandals for $39.94, also at DSW that may work for you as an alternative. Click on the photo for more information.
For accessories, Kelly kept it simple with a belt, sunglasses, and a long necklace. Click on any of the options below to purchase.