Choose a nightgown composed of soft, breathable materials like cotton, modal, satin, silk, or jersey. The material used influences how efficiently the nighty controls body temperature while sleeping.Nightgowns can be short and above the knee or full-length. Choose a length that is comfortable for your sleeping environment and personal style.Nighties can have varying lengths of sleeves or be sleeveless. When deciding on a sleeve style, keep your comfort and the temperature of your resting space in mind.