To upload a skin that is more than 64x64 go to were you create resource packs go to entitys and than to Alex(slim arms) or Steve(normal arms) from there just upload/edit the skin you want 
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To upload a skin that is more than 64x64 go to were you create resource packs go to entitys and than to Alex(slim arms) or Steve(normal arms) from there just upload/edit the skin you want