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[1]. Before the fall, man's primary task was to "tend and keep" the garden[2]