I will dress up as a NaNoWriMo author getting ready to start the 50,000-word marathon at 1 minute past midnight, November 1.
IOW, t-shirt, PJs, and slippers.
Aside from guilt-free chocolate and occasionally ordering a pizza, I don't do Halloween anymore. I had enough of it during the years when I had a house, what with the kids getting lazy about yelling "Trick or treat" and just ringing the very loud doorbell. Finally I'd shut off all the lights visible to the street and just go dark between 6-9 pm.
There was one year, though, when I was invited to a friend's place for gaming (I had to supply the game). I'd only ever been there once before, during the day, and this time the taxi driver was having a hell of a time finding it after dark, in a snowstorm. She lived in a trailer court, so it's not like we had standard street signs and house numbers to go by. Finally the driver shut the meter off and said he didn't feel right charging me when he didn't know how to find the place.
We got there eventually, though.