Silk was a fine fiber that was produced by certain insects.
In 2024, B.C. sarcastically suggested that Benjamin Sisko and Michael Webb's "demands" during the Bell Riots might as well include a couple of silk shirts and a penthouse in Singapore. (DS9: "Past Tense, Part II")
Elim Garak recommended silk lingerie from Kraus IV to Lursa and B'Etor in 2369. (DS9: "Past Prologue")
In 2370, Keiko made Miles O'Brien a handkerchief out of silk. (DS9: "Rivals")