Need to channel Jackie Kennedy!

Hi ladies, I need some major help/inspiration. My daughter (age 8) needs to dress as Jacqueline Kennedy for her 3rd grade "Great Americans" day at school. I cannot find a simple shift dress pattern for girls (size 8-12) anywhere! You know the kind...sleeveless, simple, classic...something to wear with a pillbox hat and white gloves. Any suggestions?? I would love something with a matching jacket...dreaming big here. I've tried all the biggie pattern companies and as many independent designers as I can come up with. Nothing! Please help, thanks!