One place we lived when I was a kid had very limited trick-or-treating resources. There were only about 6 houses within walking distance. So my brother and I were ghosts, you know the kind made out of sheets with holes cut out for eyes. Only our sheets covered our Hobo costumes (complete with charcoal 5 o'clock shadow and a little bandanna bundle tied to the end of a long stick). So once we had exhausted our meager options, we cleverly removed our sheeted exteriors and became new trick-or-treaters.
I don't think Hobo costumes are too popular (or politically correct) nowadays. Come to think of it, I don't see too many little girls sporting 5 o'clock shadow either.