The coat already appeared in the spoilers (check Misspitt's post), and you can get it for free!
1. Use this manual proxy: 126.96.36.199 and Port 8080
If you don't know how to use a manual proxy, click HERE
2. Go to this address: http://www.stardoll.com/en/cinema/?id=124
3. Watch the WHOLE trailer, then close the window, remove the proxy and go to your normal Stardoll.
NOTE: It might not work at the first time, you may have to try it several times. Give it a try!
UPDATE: It didn't work for some people. (me either)
Can anybody SAFE do it for them?
Thanks to QuikGirl31 for the tip and the proxy!