A fleece is a sheepskin, hung by a band around its waist. It was a period charge: a fleece Or was, unsurprisingly, the badge of Burgundy’s Order of the Golden Fleece, c.1430 [Guide 170]. For related charges, see pelt, sheep.
Robert Longshanks of Canterbury bears: Gules, three fleeces argent.
Gwendolyn Anne the Obscure bears: Erminois, a fleece sable.
Gillian de Chyviot bears: Argent, a fleece purpure and a chief rayonny sable.