Floral Button down long sleeve silk like blouse shirt

Super cute. Never used. No size of fabric tag. But it feels like silk. I’m not sure. But it’s smooth to touch. Cute rose floral details. Reminds me of a Dior design. Approximate measurements: Pit to pit: 21.5” Pit to hem: 15.5” Sleeve length: 24” Shoulder: 17” Top to bottom: 28”