Items marketed as red “silk” or silk-style nightgowns are most often polyester or polyester blends. Common listings show 100% polyester or blends such as 95% polyester with 5% spandex/elastane.
Fabric names reported include satin and tricot; descriptions also reference woven or knit constructions. In short, expect satin-style and tricot finishes as well as woven/knit fabrications.
Reported lengths range from about knee-length up to mid-calf. Example measurements given for knee-length styles are roughly 38–39" shoulder-to-hem.
Fits are generally relaxed or regular. Several listings note that if you fall between sizes, ordering the larger size will give a looser/roomier fit.
Product descriptions recommend these nightgowns for everyday lounging and sleep, travel and beach cover-ups, bridal preparations and weddings (including honeymoons), pajama parties, romantic evenings, and gifting occasions like birthdays or Valentine’s Day.