Where does “шёрстка” come from?

шёрстка (Russian) comes from Russian шерсть, from Old East Slavic сьрсть, from Proto-Slavic sьrstь, from Proto-Indo-European ḱer(s)- — rough hair, bristle.

Ancestry of “шёрстка”, step by step

StepLanguageWordMeaning
1Russianшерстьfur, hair; wool; woollen cloth, worsted, wadding
2Old East Slavicсьрсть—
3Proto-Slavicsьrstьfur, hair, wool
4Proto-Indo-Europeanḱer(s)-rough hair, bristle
Every word from Proto-Indo-European ḱer(s)- →Every word from Proto-Slavic sьrstь →Every word from Old East Slavic сьрсть →