It does beg the question, did God create the loom on the fifth day, so they could immediately clothe themselves, or on the seventh day, after their exact dimensions were known?
They clothed themselves with fig leaves. (Genesis 3:7) This is also why some hold that the tree of knowledge was a fig tree.
Other possibilities are grape (and the fruit was actually wine that they drank), or wheat because when it's when a baby first starts eating solids that they start really understanding the world around them.
