First of all, It can make it so you can have muscles that are actually there! It could be for batman and body lifters (For Skins)

1.8 Makes it so that we can add two layers on the body and legs and arms. So we can have suits while with a human body.

Second, The template (as seen above) is very easily understanded (Regular body, Then the 2nd layers)

I cant really think of anything more so bye!