Fustian

fustian \ˈfəs-chən\ noun: 1 a. a strong cotton and linen fabric, b. a class of cotton fabrics usually having a pile face and twill weave, 
2 a. high-flown or affected writing or speech, b. anything high-flown or affected in style

Etymology: Middle English, from Anglo-French fustian, fustayn, from Medieval Latin fustaneum, probably from fustis tree trunk, from Latin, stick, cudgel

How did we get from “fabric” to “affectation?”