1) A material having a velvet nap on one side, usually of worsted but sometimes of silk.
1607 two blacke cloakes thone lind with velvet thother with shagge, Whitley
1622 one white shage boulster, Cottingley
1693 6yds shag Ł1 13s, Selby. The meaning had expanded by the eighteenth century: 1761 long cut shagg made of goats hair or hair shagg made of mohair, Wakefield.