Albert Barnes Commentary Leviticus 13:57-59

"and if it appear still in the garment, either in the warp, or in the woof, or in anything of skin, it is breaking out: thou shalt burn that wherein the plague is with fire. And the garment, either the warp, or the woof, or whatsoever thing of skin it be, which thou shalt wash, if the plague be departed from them, then it shall be washed the second time, and shall be clean. This is the law of the plague of leprosy in a garment of woollen or linen, either in the warp, or the woof, or anything of skin, to pronounce it clean, or to pronounce it unclean." — Leviticus 13:57-59 (ASV)

Either - in these verses, should be 'or'. See Leviticus 13:47, Leviticus 13:49.

It should be noticed that no religious or symbolic rite is prescribed for leprosy in clothing. The priest had only to decide whether the process of decay was at work in the article presented to him and to pronounce accordingly. Compare the leprosy in houses, Leviticus 14:33–53.