Your robe capsule is great and looks elegant as well as comfortable.
I want my robes to be long and machine washable. At present, I have three ones . Two are in a silk-look fabric (cotton & polyester) and look like your grey one, but are a bit more shiny. Mine are royal blue and deep grey. My third robe is in black velour with white embroidery on the shawl collar.
I wear my thin blue robe in spring and summer, my thin grey one in spring and fall, and my thick black robe in winter.