Vintage Helen of Troy Red and White Women's Zipper Night Gown

Vintage Helen of Troy Red and White Women's Zipper Night Gown. It feels like nylon. There are some loose strings and a few small stains. Some area looks like the color has started to wear off. The catagory of night gowns wasn't on there so I just picked one that was. There isn't any tags except the brand tag so I don't know what size it is. Measurements: Shoulders - 18 1/16" Arms - 12" Chest - 21 1/2" Length - 48 1/2" Opening - 27 3/16" These measurements may not be exact but it's what I got.