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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Popular Halloween costume:

BARB: Popular Halloween costume after the first season of "Stranger Things"
SKELETON: Popular Halloween costume
SUPERHEROES: Popular HALLoween costumes
ELSA: Popular Halloween costume the year after "Frozen" came out
MAID: Popular sexy Halloween costume
FLO: Ad character that inspired a popular white-aproned Halloween costume