If you are from Brazil - Log in and paste this http://www.stardoll.com/en/clubs/home.php?id=3243005&action=ma&ac=3243005
If you're not from Brazil do this:
Go to a proxy like:
brazilunblock.info OR brazilsurf.info OR brazilproxy.com
Paste the link into the blank box of the proxysite
stardoll.com/en/clubs/home.php?id=3243005&action=ma&ac=3243005 
Click Go 
Log into Stardoll
Wait till page loads. You should automatically join the club
go to stardoll as always

the bikini should be there

enjoy