Silk Threads Long Sleeve Embellished Shirt Large

This shirt is pretty interesting. I can’t find the brand anywhere and it does not feel like silk or a silk blend at all. There is no tag saying anything about the fabric content and if I were to guess based on the feel, I’m guessing a cotton rayon blend only because of the embellishments and the stretch to it. I find it to be a boho type of shirt with flat lay bust measure of 19” and think it would be great for the fall