Cloud nine, no idea what
VB are looking for in the way of garb, but perhaps the following can help you with the actual interview. It's something I put together a while ago for another wannabe FA and she said it was of assistance in her succes.
U might also want to read up on the techniques of the "criteria based interview", very popular with HR people at the moment!
"Find a number of resons why it would be to the AIRLINE'S advantage to hire you, not only why YOU want to fly with them.
They usually ask for your weak points. Find some that you can present in such a way that they are really advantages for the job concerned.
Make sure you have answers ready for when they ask you if you are not over qualified or too well established for a complete life change such as this.
In the group sessions, try and strike a balance between being too concerned with others wellfare on the one hand, and being too much of an individual on the other hand. When discussing with your group, take note of the people not having much to say and try to involve them in the discussion (shows you are socially aware, smart and good with people)
Try and make a summary during the discussion of what was said and steer towards a consensus. Shows u are able to seperate main issues form side issues and that you want to get on with the job at hand.
When getting into a conflict with another group member, or when the interviewers try to provoke you or put you in role play with a "difficult passenger", Listen first, Think and the Speak.
Summarize what the other person has said. This way you aknowledge their feelings and take down barriers. It also checks if you have understood correctly. Then start on the solution.
Prepare yourself by writing out all the possible questions they might ask you beforehand, and formulate the answers while you still have time to think in peace, instead of being put on the spot during the interview with questions you did not see coming and having to grope for an answer.
There is no shame in saying "Errm, let me think about that for a bit". No problem with a bit of silence, and much better than ranting on like the Mad March Hare, spouting rubbish in desperation.
The most important aspect of your future job is Flight Safety and saving lives in an emergency. Show that you can remain cool under pressure. Breathe deeply when u feel stress taking over,and THINK b4 you speak or do something rash!
Like our someone said on pprune recently, you don't need to be Einstein to be an FA!! You need to present the right facade at the interview, since presenting a facade is also what you will have to do on board.
Just make it look like the real thing.

When it comes to personal questions, be honest though. No gain in faking that part."
Hope this makes sense to you and helps a bit! I've been an FA for 20 years

and
still think it's the best job in the whole wide world!
All the best!