Where does “sealskin” come from?

I need to flag an issue: the etymology chain provided appears to have problems that prevent me from writing an accurate summary. The chain shows: - English skin | Middle English sele | Old English seolh | Latin sigillum | Latin signum | Proto-Indo-European ser- | Proto-Indo-European ser- However, "sealskin" is a compound of "seal" (the animal) + "skin." The chain provided traces only "skin," not "seal" (the animal). Additionally, the chain itself seems problematic—"seal" (the animal) typically derives from Old English *seolh*, but the connection through Latin *sigillum* (a seal/signet) and *signum* (a sign) to PIE *ser-* is not standard and would need verification. To write an accurate one-sentence origin for "sealskin," I would need: 1. The etymology chain

sealskin (English): A type of fabric made from the skin of seals; Any...

Definitions

  1. A type of fabric made from the skin of seals; Any...

Ancestry of “sealskin”, step by step

sealskin traces back through two separate lines of ancestry.

via English seal

StepLanguageWordMeaning
1EnglishsealA pinniped (Pinnipedia), particularly an earless seal (true seal) or eared seal
2Middle EnglishselGood fortune, prosperity, luck
3Anglo-Normansëel
4Latinsigillumfigurine, statuette; seal
5Latin-lusAlternative form of -ulus; diminutive suffix
6Proto-Italic-elosForms desubstantival and deadjectival diminutive nouns
7Proto-Indo-European-e-lós
8Proto-Indo-European-lósForms agent nouns from verbal roots

via English Skin

StepLanguageWordMeaning
1EnglishSkinThe outer protective layer of the body of any animal, including of a human
2Middle EnglishskynThe skin; A layer or cover located in the inside...

Words derived from “sealskin

Every word from Proto-Indo-European -lósEvery word from Latin -lusEvery word from Latin sigillum