If something is done gaudily, it is done in a gaudy way: too bright, too shiny, too much colour, and it looks cheap rather than fine. We use it of clothes, make-up, lights, shop signs, and rooms — the manner of the show, not a kind of object. It always leans to dislike. A dress can be bright and happy; dressed gaudily means the brightness feels loud and a bit tasteless. It is not a rare word, but it is a judging word: people use it when they want you to see the extra glitter and not admire it.