Certain skins make you invisible.

So I came along this issue when I was wearing my trusty free skin from the Redstone Specialists pack, when I loaded into Minecraft, my skin was still loading but I didn't put much attention to it. When I loaded up a world, it didn't give me that sign where it told me my skin was still loading but yet again, I didn't put much attention to it. But when I loaded in, my hand wasn't there so I went into third person and my skin was invisible. Please help me, I can't change my skin so please, HELP ME. (first skin is invisible and i think more are invisible)