The skin system has changed for 1.8 including new layers, new skin templates are required.
Use 
as template.
See http://minecraft.gamepedia.com/Skin#Creating_a_skin
I'm not sure of the pattern here, but whenever I have a jacket texture and no sleeve textures, my left arm turns completely black. Will continue updating in the comments as I break it more.
Note that it appears that my (classic) arm texture is turning black, not my (new) sleeve.
- is duplicated by
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MC-46053 no hat layers on minecraft player
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