A couple of small corrections to the post below, due to some rather broken English/Italian conversations between myself and Gianni. PS3 and PSC2 were the wrong way round, in terms of being silk and cashmere. That has now been corrected below.
And two of the cashmeres, PSC1 and PSC3, are actually vintage wool. Lovely stuff (I have one myself) but obviously not as soft, or expensive, as the cashmere.