Sforno on Genesis 3:21/ספורנו על בראשית ג׳:כ״א

1ויעש ...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)

2וילבישם, in order that He would not have to expel them from Gan Eden while they were naked. Not only that, but if they would dress themselves in these coats after having been expelled, they might delude themselves that they had improved on G’d’s handiwork.