I think they are Linen with slubs in the fabric 

Used condition - They have been washed so the edges are not completely straight like they would have been if new - One of the Chair backs still has a mark (Photo 12) & the Sofa cover has a fabric flaw - shown front & back (Photo 5&6)

Sofa Cover - Approx Width  - 32 inches

                     Approx Height - 25 inches

Chair Covers - Approx Width  - 15 inches 

                        Approx Height - 25 inches

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