The morning after Halloween, when the children are seen walking in the streets in a trance during Sarah Sanderson's song, they're all wearing coordinated pajama sets, complete with robes and slippers.
It is the wee hours of the morning, so kids wearing pajamas may just seem like a given.
However, Winifred cursed all the adults at the party to "dance until [they] die," so most of their parents probably wouldn't have been around to make the kids change out of their costumes and get ready for bed.
This also seems to explain why some of the children are still wearing parts of their Halloween costumes — like masks and crowns — even though they're coming from their beds.
ncG1vNJzZmivp6x7o8HSoqWeq6Oeu7S1w56pZ5ufonyqutOeqZ6rpJ67qHnHqJquq12lvKTB0mabnqyRnrm0ediorGamlauys3nGqKs%3D