1 [count] : the woolly coat of a sheep
2 a [noncount] : a soft cloth that is used to make warm clothes
warm fleece jackets
2 b [count] chiefly British : a jacket made from this cloth
— fleecy /ˈfli:si/ adjective fleecier; fleeciest
fleecy white clouds
soft, fleecy fabric
Learn about fleece as a verb.