The Fourth Doctor

TL;DR: Started as kind of a closet cosplay—coat was my dad's; pants, shirt, and hair were mine; hat belonged to someone in my family and had been really beat-up from a lot of use, which worked well. Borrowed different people's scarves for different iterations, which also worked well. Eventually got a proper replica scarf and sonic screwdriver, and found a good vest at a thrift store.

Also, sometimes I carry a bag of Sour Patch Kids depending on whether I remember to order Jelly Babies far enough in advance because Jelly Babies are hard to find in stores in the U.S.A.