Sentence:  He wore a pretty large wig, which had once been white, but was now of a browniſh yellow; his coat was one of thoſe modeſt-coloured <WSD>drabs</WSD> which mock the injuries of duſt and dirt; [...] 
Meaning of the word marked with <WSD> tags:  "Often in the (plural) form" '''(drabs)''': apparel, especially trousers, made from this fabric.