Chaperon

Tobias used to chaperon his little brothers while they trick-and-treated.

"I am, as it were," she concluded, "the chaperon of my young cousin, Lucy, and it would be a serious thing if I put her under an obligation to people of whom we know nothing. His manner was somewhat unfortunate. I hope I acted for the best."

His head and face cover'd with a chaperon, out of which there are but two holes to look through.