וַיַּעַשׂ֩ יְהוָ֨ה אֱלֹהִ֜ים לְאָדָ֧ם וּלְאִשְׁתּ֛וֹ כָּתְנ֥וֹת ע֖וֹר וַיַּלְבִּשֵֽׁם׃ (פ)
Und Gott, der Ewige machte für Adam und sein Weib Röcke aus Fellen und bekleidete sie.
Rashi on Genesis
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).
Rashbam on Genesis
כתנות עור וילבישם, coats, long enough to cover the whole body.
Sforno on Genesis
ויעש ...כתנות עור, without any input by man, similar to a description of the Talmud of what the earth will produce without human input in idyllic times when ready made bread rolls will be produced by the earth (Shabbat 30)