Quickest easiest Halloween costume ever

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Dd age 12 tells me at 6pm tonight that she needs a costume for trick or treat. I'm at work all day. She will get home from school at 5pm. No time to shop. What should she wear?

Jedi Knight? Cut neck and arm holes in cream pillow case. Brown belt, brown cardi. Tinfoil wrapped around an kitchen paper roll and stuck in the belt.