The cheapest option would be as Adam/Eve from the book of Genesis...
A humorous character.
Mary from the Secret Garden Dorothy from the Wizard of Oz
A good character to dress up for Halloween is any of the characters from the movie Pirates of the Caribbean.
For a baby, I would not suggest it. If it is a character in a book, go on ahead.
You have to use your imagination!The best way to invent a character is just to imagine what he or she would be like. Many writers start by imagining a particular character and design a story where that character might be interesting. Other writers start with a good story and try to imagine a character that would fit into the story.Here are some things to think about:What do they look like?How do they dress?How do they act?What are some of their beliefs?What is their personality like?How do they talk?However you do it, here are some good character charts that will help you create your character. They have questions about the character's background, appearance, and personality.
cat woman possibly
Clothing would be a good start. Maybe then try dressing up as a character.
a good red or blue dress with a design and your hair up high would be great
Alice in Wonderland
the witch the giant charlie willy wonka
Beackam is good
workin' 9 to 5, what a way to make a livin'. . .