Cheshire Cat Costume Ideas

Alice formal commitment ceremony Affairs wonders!?
So I have an Alice in Wonderland in the subject Commitment Ceremony! Yay for me! But I'm having trouble coming up with what my bridesmaids and flower girl and me and my partner should use! We make the characters marriage issue and want you to see the fun and yet formal. So I try to find the clothes to know the characters! I am the March Hare, because my best friend is mad as a hatter formal, but my partner will be the Cheshire Cat! ^ O ^ In all FUN! But … Can anyone help me find a dress that fits like a rabbit from Mars and Women's formal dress? And my daughter flowers be Alice, and my ring bearer will be the white rabbit. … But I can not find a suitable dress for her and a good suit for him. It's just all so the crazy … Does anyone have any ideas for Alice in Wonderland wear? Something that is not exactly a costume, but still looks like a bit of the celebration of the characters?
Alice in Wonderland is a story made for the love of children! How "formal" do you think it could be? Just playing dress up and have fun with it.