After 2 days of waiting, the suitcase has finally become available. :)
~If you are on USA - Log in and send a wishlist HERE.
~If you're not on USA - Follow these steps:
1. Go to a USA proxy like:
uswebproxy.com OR webwarper.net/ OR sitegetter.net/ OR dontfilter.us/ OR proxoin.com/
2. Paste the link into the blank box of the proxysite
3. Click Go/Browse or just hit Enter on your keyboard
4. Log in to Stardoll
5. Tick any of the games and click Create My Wishlist button.
6. Wait till page loads
7. Fill the Recipient's E-mail box with a fake e-mail (it must have a valid ending, for example email@example.com)
8. Click Create My Wishlist button once again and wait till page loads.
9. You can now leave the proxy and go to Stardoll as usual
The suitcase should be in a Nintendo 3DS bag in your suite. :)
P.S. It might take some time for the item to appear in your suite.