I have this wonderful Stroock fabric coat. I read that Stroock was famous in the '30s & '40s for creating exotic fabrics with llama, vicuna, alpaca, cashmere, etc. Not sure how long the company was in business The fabric in this coat is called PREFERENTIA by Stroock. I am trying to find the content of this fabric. It feels like a wonderful heavy cashmere to me. There was a catalog made called "Fine Fabrics by Stroock". -but I don't know how to find it. Any suggestion would be appreciated. Coat is a clutch coat with a large shawl collar, so am I looking at late 40s or 50s??? Thanks everyone.