Get a bandanna(preferably one that you can fold into a wide rectangle). Put this in your hair.
Next get a pair of light jeans (preferably the straight leg ones) and tight if you want to be behind the times (no offense moms out there).
Then a short sleeved shirt (preferably yellow, but any color will do very well) you can leave your hair down, or put it in a bun or pony tail. You can even get those thin plastic glasses frames with out the prescription (found at most stores) and sneakers (preferably white ones). Don't forget the white socks. You can even roll the pants up at the bottom!
There ya go! All done!, Have lots and lots of fun and happy Halloween!
Thanks to Punkymoon for this fun idea!