What is the theme of Swift things are Beautiful?

If this is about a Beautiful Nymph on Going to Bed then it is about how the nymph removed all of her accoutrements such as a glass eye, false teeth, a whig etc to reveal a flabby grotesque creature underneath when going to bed suggesting to us that appearances are not always what they seem and about the lengths women will go to in their vanity to cover up imperfections.