Condensed from my Missions Course (2008).
Why did Adam and Eve sew fig leaves together?
Adam and Eve were created perfect. When they sinned, their eyes were opened for they now had the knowledge of both good and evil, and they saw their nakedness. So they gathered some fig leaves and sewed them together to make a covering.
God gave them an advance look into the plan of salvation. Instead of the garments of their own making, they received tunics which God made to clothe them. The skins came from an innocent animal which had to suffer a death it did not deserve in order to clothe man whose sin created the need for a covering.
For any questions (Bible reference for this post) please feel free to e-mail Pong.