Question: Who told Adam and Eve they were naked? Answer: Their eyes were opened to the knowledge of good and evil when they ate of the forbidden fruit.
God had already defined good and evil when he told them not to eat of the tree. Exposure/shame was a result of the fall. When Eve looked at the fruit she saw it was "good for food, it was a delight to the eyes, and it was to be desired to make one wise.... " But what was really there? What did Eve see? All the things mentioned above. The fruit really was "good to eat, delighted the eyes and would make one wise"....however they had been told to not eat of it. Let's reel the tape back for a moment for an instant replay. Eve sinned the moment she doubted God's love and that had happened before her lips even touched the fruit.
And isn't it interesting that God restores us to himself in the very opposite way in which our first parents fell? They doubted God's love. We're restored to God by faith alone!
I'm persuaded our original parents would have been allowed to eat of that fruit if they had grown into maturity. The fruit was not bad, it was disobedience to God's command which resulted in their knowledge of nakedness. The human race begins in a garden and in the last book of the Bible we find them in a "garden city." It was always God's intention for mankind to exercise dominion over this world. God does not have a Plan B!