TT #182 · Parshas Shemini · Aliyah 5 · Passuk 32
Chabad.org — Vayikra Chapter 11 with Rashi
English: “Or a garment or leather”: just as garment and leather mentioned with regard to a corpse refer to materials susceptible to impurity, so here the verse includes comparable materials.
Shabbos 64a.
E-Daf.com — Shabbos 64a (Tsurras Hadaf)
Analogy — The text derives the scope of impurity through comparison of the categories named in the verse.
The garment-and-hide rule is linked to the corresponding dead-body rule.