You minecraft players out there might have heard that the game is updating to 1.8 soon, which offers support for a new skin file format. You can now create separate arms/legs, and make use of 'hat' layers on top of all surfaces! (not just the head)
We updated skincraft to handle the format. Old skins are still backwards compatible, so don't worry. We also fixed a few bugs and added a couple extra features- such as being able to see the inside surfaces of the model and pulling a skin file directly from a minecraft.net username.
http://www.newgrounds.com/portal/view/571250
RolandTheJabberwocky
How do you turn one of the pre made textures into a jacket?
Afro-Ninja
Unfortunately that is not supported right now, because the original pieces were never made to fit in other layers. We may be able to get this in for a future update.