NWOT Rosemunde Copenhagen White Dress Tunic

Rosemunde Copenhagen White Dress Tunic with belt. New without tags. Literally without tags. All tags. I have no idea what size this is or what it’s made of! Sorry. European brand I’m selling for my globe trotting friend. Attached photo of their website in case you want to check them out. Approximate measurements. Laying flat, straight across. Pit to pit - 21”. Waist - 21”. Length - 39”. No stretch. Feels like a cotton Rayon blend material. #U-4