hopsack
noun
hop·sack ˈhäp-ˌsak 
variants or less commonly hopsacking
ˈhäp-ˌsa-kiŋ
: a rough-surfaced loosely woven clothing fabric
Example Sentences
Recent Examples on the Web The blazer, which is half-lined and made with unpadded shoulders, is cut from a wool-mohair hopsack, whose open weave ensures easy ventilation. 
Eric Twardzik, Robb Report, 19 July 2022 The chair is in original condition and has the original hopsack material and color associated with the 1960s. Carolyn Patten | For The Oregonian/oregonlive, OregonLive.com, 3 Mar. 2018
Eric Twardzik, Robb Report, 19 July 2022 The chair is in original condition and has the original hopsack material and color associated with the 1960s. Carolyn Patten | For The Oregonian/oregonlive, OregonLive.com, 3 Mar. 2018 Word History
Etymology
Middle English hopsak sack for hops, from hoppe hop + sak sack
First Known Use
1888, in the meaning defined above