There are several reasons an adult might wear a costume for Halloween. One is to get into the spirit of the night by dressing in a costume to greet children who come trick or treating. Another is to walk with children who are out for trick or treat. And, the third reason is to attend a costume party.
These can all be done with a well chosen costume, but there are different things to consider with each costume use.
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Comments
The above paragraphs emphasize comfort, especially against overheating with elaborate costumes and face masks.
Another concern might be slightly inclement weather.
The summer here thus far shows itself as alternately regular downpours and regular sprinkles.
Halloween block parties and trick-or-treats perhaps "weather" gentle sprinkling. A block party possibly would have covered spaces.
But would the mildest sprinkling call for umbrellas or would there be no trick-or-treats at all?