This might be useful. But won't this skin be completely black in the game?

Invisible Skin

Actually it is visible here as a black when you load it to the minecraft, it will completely invisible(whole body will be transparent) 

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Hello! Do you want to be have invisible skin? and if you don't like to have any skin in minecraft then this skin is for you, nobody can see you or cannot  make you defeat, enjoy! Note: The Skin will looks completely black but when you load it to the minecraft, it will get Transparent (Invisible)

Invisible Skin Minecraft Skin