You've got some tense confusion in the line "Billy remembered last Halloween, this is the same costume Charlie wore," change it to "this was the same costume," or better: "it was the same costume."
Other than that I don't see any obvious or mechanical errors. Personally, I'd get rid of the last sentence entirely. It would be stronger if its idea was left implied, as anyone who has read your story should ask the same question quite naturally.
Write on!
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