No proxy needed (yay!) for the third gift from the X-Box Kinnect campaign.
Log into regular Stardoll and then paste this in your URL box at the top of the page:
http://www.stardoll.com/en/do/campaign/kinect3.php
You will be taken to the X-Box website.
Hit your back button to return to Stardoll.
The outfit will be in a bag and a hatbox to the right of your closet.