A nightsuit typically refers to a comfortable and cozy outfit designed for sleeping. It often includes a matching set of a top and bottom, like a pajama set, or a one-piece garment such as a nightgown or romper. Made from soft, breathable fabrics like cotton, flannel, or modal, a nightsuit aims to provide a relaxed fit that ensures a good night's rest. The design can range from simple and classic to playful and patterned, catering to personal preferences and seasonal needs.