In verses 7 and 21, we are presented with two types of clothing - garments made of fig leaves, and garments made of animal skin. These two types of covering are typical of works-based and faith-based religion (respectively), in a couple of ways.
Adam and Eve created the fig-leaf coverings themselves, whereas God provided them with animal skin clothing.
Plants are in many ways significant of man's work in scripture. Before the fall, man's primary task was to "tend and keep" the garden