REALLY! To get the blends right and not waste SS on testing and getting the right proportion of silk to Cotton Ratio!
Freaking logical if you think about it. The traditional silk is the cheaper stand in.
Now if they had used a significant portion of the SS the have to test this there would be no end to the amount of moaning and Bi>>ching from people here
Now who do you think wants this info? Maybe the people making the clothing!