Halloween?

I feel pretty lame for not having a halloween costume. I told one of my friends i would cosplay with her as Dib and Gaz from the show 'Invader Zim', since Gaz is her favorite charecter, and Dib is mine, but.....I didn't make a costume. Now, halloween is 3 days away and I probably wont even go trick-or-treating. (I always go at someone else's neighborhood, and no one has invited me) Last year I made my costume pretty quickly, in a hotel. (Long story) Shame.