This is the mod I used in the video, it makes your skin layers 3D!
www.curseforge.com/minecraft/mc-mods/skin-layers-3d
Also, for those who read descriptions, I was debating whether to do edited and cut or to just do no commentary and uncut. If this does well, it'll continue on this channel, if everyone prefers edited and cut, uncut versions will be put on my other channel.