October is the Costume Challenge - make an item based on a character from a movie / book / TV show. It can be completely crazy, or a subtle nod.
This challenge, while it fits with seasonal demand for halloween costumes, is not intended to be limited to such ideas. Recognisable character costumes are fine, but its also worth considering researching a costume designer and looking at elements employed in film and theatre.
You might also consider developing a character inspired item which to wear normally. A modified approach, if you don't fancy a full commitment to costume, or if you've ever watched a show and genuinely wanted to dress like a character on screen! (Emma Pillsbury from Glee?)