Vintage Say Lu | Night Gown Floral Button Front 3/4 Sleeves- Size M L XL ????

Vintage Say-Lu night gown Condition: Gently worn in excellent condition. Little to no sign of wear! Unfortunately there is no size or care tag. * button front * floral print * 3/4 sleeves * flowy detail at the end of the sleeves * Fabric content: material tag is missing Size- size tag is missing, so please double check measurements. There is no stretch, but I would guess a size large? Approximate Measurements: chest (underarm to underarm)- 20 inches length (back shoulder to hem)- 54 inches