Vintage boho prairie dress - Beth Dutton style - size M

This is a stunning and comfortable long sleeve dress I purchased at a Vintage shop in Quebec. There is stretch to it. - High collar - Zipper back - peek-a-boo cutout at front. This is a hand-made dress so not tags. So I am am not sure of the material. For sizing reference, I am a size 6 medium, 5"6 tall and it fits me perfectly with heels or flats.