It looks like a black skirt with black tulle coming out from the bottom. As for the snack bags on the skirt. I suggest doing what this cosplayer did that I found from google. http://cosplayidol.otakuhouse.com/wp...19967215_n.jpg
But you'd probably want to add more snack bags to get it too look like this. http://lh5.ggpht.com/-2UHQdlRIa8U/Tx...5B4%25255D.jpg
Hope that helps.