Many Henley sleep sets are made from a 60% cotton / 40% polyester blend in a thermal knit construction, while some nightgowns are offered in 100% cotton.
Common styles include a Henley-style button top paired with jogger or pant bottoms (a 3-button Henley with jogger bottoms is frequently offered) and short-sleeve Henley nightgowns featuring a front-button Henley neckline.
Tops typically feature Henley/button-front closures, while bottoms are usually pull-on with elastic waists; some styles also include a functional drawstring.
Listings commonly identify the fabrics as knits, with specific mentions of thermal knit and jersey knit constructions.
You’ll find short sleeves on many nightgowns and Henley-style or U-neck designs; descriptions commonly note short-sleeve garments with a front-button Henley neckline.