“Silken” comes from “silk” (seda). Sometimes females wear a silken (de seda) dress, and also “silken hats” (sombreros de copa).
There are silk “industries” industrias sederas) in some countries, and these industries use silk thread (hilo de seda).
A material could be similar to silk (sedoso), or the material could have a “silkiness” appearance (sedosidad).
There is another use. Mortals can have a silken voice or manner (suavidad, lo mimoso). A voice can sometimes de silky (suave).
Do you have a silky voice or silky manner?