Wearing undergarments beneath a nightgown is entirely a matter of personal comfort, sleeping habits, and individual preference. Most traditional nightgowns are engineered to be worn directly against the skin without underwear to maximize breathability, comfort, and unrestricted relaxation during sleep. However, some individuals prefer to wear lightweight cotton briefs or seamless panties for added modesty, personal hygiene, or support, especially when lounging around the house before bedtime or wearing sheer garments.