וַיַּעַשׂ֩ יְהוָ֨ה אֱלֹהִ֜ים לְאָדָ֧ם וּלְאִשְׁתּ֛וֹ כָּתְנ֥וֹת ע֖וֹר וַיַּלְבִּשֵֽׁם׃ (פ)
여호와 하나님이 아담과 그 아내를 위하여 가죽옷을 지어 입히시니라
Rashi
כתנות עור GARMENTS FOR THE SKIN — There are Agadoth which say that they were smooth as fingernails, cleaving to their skin; whereas some say that they were made of material that comes from skin, as for example, the hair of hares which is soft and warm, and of this He made garments for them (Genesis Rabbah 20:12).
Bekhor Shor
Garments of skins: That is to say, garments for the skin of their flesh; as no beast had yet been flayed. And likewise did Onkelos translate [it].
Chizkuni
כתנות עור, according to Rashi, “tunics made of skin/leather.” This “leather” was smooth as nails, no hair ever having been on it. Rashi contradicts commentators who explained the term as referring to the skins of hares which are completely covered with hair. (Compare Bereshit Rabbah 20,20)