Most people undress completely, while others choose to keep their undergarments on. https://ziomom.com/%EC%8A%A4%EC%9B%A8%EB%94%94%EC%8B%9C-%EC%9D%B8%EC%B2%9C-%EC%8B%AC%EC%8B%A0%EC%9D%98-%ED%9E%90%EB%A7%81%EC%9D%84-%EC%A0%9C%EA%B3%B5%ED%95%98%EB%8A%94-%EC%83%88%EB%A1%9C%EC%9A%B4-%ED%8A%B8%EB%A0%8C/