Halloween is just around the corner and if you or your kids are planning on going to a party or trick-or-treating around the neighborhood, you’ve probably already purchased costumes. Afterall, Halloween is a booming business for retailers and Americans will spend around $3.4 billion on costumes this year. If you purchased a banana suit from Kmart this year, you might be frightened to learn that a costume company, Rasta Imposta, sued Kmart over that very banana suit. Never fear, Kmart is the one that might be on the hook, not you. Rasta Imposta filed a complaint in federal court last month alleging copyright infringement, trade dress infringement, and unfair…