Albert Barnes Commentary Leviticus 13:47

"The garment also that the plague of leprosy is in, whether it be a woollen garment, or a linen garment;" — Leviticus 13:47 (ASV)

The garment - Rather, The clothing, referring to the ordinary dress of the Israelites in the wilderness; namely, a linen tunic with a fringe (Numbers 15:38) and a woolen cloak or blanket thrown on in colder weather.