What is "watered-silk"

Usage examples of "watered-silk".

There was a carefully chosen hint of kzinrret too, in the watered-silk pattern of her skin-tight trousers (there were costumes available with hints of tails, but that, she had decided, would have been definitely over-egging the pudding).

As for his waistcoats, they were indescribably handsome, especially the white watered-silk one with tiny pink rosebuds em­broidered on it.