most of skin is missing and or in the wrong place.
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The explanation is simple, in reasourse packs, entity textures are stretched out, you are using a skin that is from your reasource pack, because in 14w03a, they redid how skins work, making them 64x64 but in 1.7(and your reasource pack) skins were 64x32, so, your kin is being stretched out from 64x32->64x64.
Just run your skin through this: http://www.reddit.com/r/Minecraft/comments/1vl7p7/releaseskin_converter/
Hope this helped 🙂
Duplicate of MC-50472