Longman Dictionary of Contemporary English
dressing-up
noun
EXAMPLES FROM CORPUS
▪ Instead she advocated a return to elegance ... dressing-up in the widest, and often wildest, sense.
▪ Such dressing-up was, like glam rock before it, a boys' affair.
▪ This involved quite elaborate dressing-up, and the fun and laughter of those Boxing Day nights was a treasure indeed.
Usage examples of "dressing-up".
He looked her over critically, and said: “Just as well he ain’t, for he’d be bound to give you one of his scolds for dressing-up as fine as fivepence!