It's the name prestige, to be sure, but their cottons feel just like silk and are perfect for heirloom sewing (e.g., smocking girls' dresses) and grown-up garment sewing of blouses. Most of the line is not suitable for quilting, as said earlier.
I had a huge inventory of synthetic blouses because I loved the light weight and silk feel ... but then menopause hit and these were impossible to wear in the office during my thermostat readjustment period. I splurged for the fabric (I worked in a DC law firm at the time) and found I looked the part required by my boss's billing hour rate but could still breathe and stay cool(er).