TT #265 · 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 Shabbos 28a for the inclusion of additional leather types.
E-Daf — Shabbos 28a · Shas.org · Sefaria — Shabbos 28a, source text and translation
English: The wording “or in leather” includes leather from an impure animal and leather tanned by a kohen.
Textual derivation
The leather category includes these additional kinds of leather specified by the Gemara.