Upon the fall, we're given coat of skins. Not just a skin but skins, plural. We have many layers of skins if internal organs were taken into account. And it's from lamb. That's why it had to be the Lamb who was slain for once and for all.
Unto Joseph the coat of many colors is given. Foreshadow of the new body. No more coat of lambskins. And what 'colors' are made of? Light. The new body is made of light. Full spectrum of it. You know who is the light also.
This is my theory and I think it’s right. Rejoice.