making my own alice in wonderland costume..help please!?

I wanna be alice in wonderland for halloween and I’m gonna make my own costume..but i dont really know wheer to find stuff for it.. I dont sew at all and I already have the black mary janes for it..but can anyone give me some ideas on what i could use at home or cheap places to go for an apron or dress? i only have a couple of days to get this stuff.

theres what she looks like vvvvv
http://i230.photobucket.com/albums/ee306/hannah_hoe888/Alice_in_Wonderland.jpg

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