1) The girth is the belt placed round a horse’s body to secure a saddle or pack. It was made of strong woven material called girth-web.
1395 It. pro vj pes de gyrthwebs, ijs, Whitby
1581 Item payd ... for xiij yeardes of gerthwebe for Ned, js ijd, Stockeld
1585 Item two lodesadles with garthes & wantoes, 6s 8d. Rastrick
1628 3 sadles, bridles mantoes [sic for wantoes] and overgarthes, Pudsey
1696 garths and wantow, Holmfirth.