- Scout from To Kill a Mockingbird: I love this book, and I think that Scout would be a pretty easy. Besides a short-sleeved shirt and a pair of overalls, all you really need to complete the look is short hair (or hair in pigtails) and sneakers. If you want to be more ambitious, you could also dress up in Scout's ham costume.
- Laura Ingalls Wilder from the Little House series: This is another (fairly) easy costume to put together. Throw on a prairie dress and a sunbonnet (you buy one or make your own), and make sure you have brown hair, which is the source of angst for Laura. This costume would probably work for one of the American Girls.
- One of the Little Women: Depending on your physical attributes, you could go as Meg, Jo, Beth, or Amy. Beth is probably the easiest - all she needs is a long dress, an apron, and a basket (cats are optional). However, if you are blond, you could easily pull off Amy with her sausage curls and precocious personality.
- The Cat in the Hat: Besides the hat (which you can easily find at a costume store), all of you need to do is dress in black and put on some white gloves. Cat ears and whiskers complete the look. If you can get two people to dress up like Thing One and Thing Two, so much the better.
- Peter Rabbit: You could go all out and rent a bunny costume, but the easier (and cheaper) option is to throw on some rabbit ears and a blue jacket or shirt.
- Waldo from Where's Waldo?: You will need the iconic striped shirt and hat and glasses, as well as a pair of jeans. Go up to people all night and ask them, "Where am I?"
- The little boy from The Snowy Day: If it is unusually chilly where you are on Halloween night, put on a red snow suit and call it day.
Stay tuned - I also plan on doing a post on literary-inspired costume party themes and literary costumes for couples.