Why were they ashamed to be naked? There were no other people in the garden but them and they were married! I think that they were ashamed and shame makes us want to be invisible. Sin was shame with its eyes opened. And they hid...in shame! But they were still skilled. The sin did not take away the knowledge or skills because they knew how to make clothes...they sewed!! Furthermore, they knew the parts of the body which caused the shame, they were able to see their physical differences but not find the beauty in it. The covered the portions which were designed to reproduce life...their loins!