What could i wear to the premier of Alice In Wonderland tomorrow as a costume?

A black jacket* over a white button-down shirt and a black skirt, perhaps with red or gold stockings and black shoes. You may even be able to find some diamond-patterned stockings given the popularity of argyle. If you can find a necklace with some suspended red jewels, that'd emulate the neckline quite well. I wouldn't try to get into more of that bodice detail. You may be able to take some post-V-day sales to your advantage and pick up something with a heart pattern, but it's not necessary.

*Bebe often has puffy sleeves

I think you should wear a red dress, I found this beautiful dress for you

http://www.nexteve.com/shop/evening-dresses/F6328....

But simpler and probably cheaper dresses like:

http://4.bp.blogspot.com/_B6J6nGs6VwA/SZGppt-emMI/...

They have sweetheart cuts so it resembles a heart :)

I just typed these up on google images: Red dress

or Red dress sweetheart or even just Short Red dress

They bring up loads of pretty dresses. Anything like that would look beautiful.

For shoes, you can wear boots, either black or white though if you search up Queen of Hearts costume they show pretty shoes and stuff as well:

http://images.buycostumes.com/mgen/merchandiser/34...

Here are some more shoe ideas, probably taking the theme a little too literally:

http://images.google.com/images?um=1&hl=en&rlz=1C1...

Anyway, good luck!

You can also find many clothing from here as well of your own choice. I think these are some of the reference i have provided may help you out.