This is the famous “Marie-Antoinette” dress from the Royal Ontario Museum in Toronto. It should be noted that the Toronto gown was simply presented as “attributed to Rose Bertin” without any mention of prior ownership by Marie-Antoinette.
ritasv: “ Woman’s Robe a la Française Europe, circa 1725 Costumes; principal attire (entire body) Silk plain weave (shot taffeta) Center back petticoat length: 37 ¾ in. Center back robe length: 60 ¼ in. cm) Purchased with.