This is a transparent t-shirt that is worn over your skin. It gives the effect of a tattoo on your back and can be worn WITH ANY OTHER tattoo skin. Since it's a clear shirt, and the tattoo is in a spot that would normally be hidden by a shirt, you can swap this with your shirt and it looks like you've taken your shirt off and exposed your tattoo.

Left side is shown with the standard 50 degree skin
Right side is shown with the Feral Tribal Tattoo skin