TT #263 · Parshas Tazria · Aliyah 7 · Passuk 48
English: or in the warp or woof of linen or wool, or in leather or any article made of leather,
Torah Temimah cites Sifra (Toras Kohanim) for the completion requirement for textile materials before they become susceptible to garment tzaraas.
Sifra — Vayikra 13, Midrash Sefer
English: Might warp, woof, and related textile materials become susceptible immediately? The word “garment” teaches that, like a finished garment, each becomes susceptible only when its manufacture is complete.
Textual derivation
Warp, woof, and related textile materials become susceptible to the garment-tzaraas rules only once their manufacture is complete.