Skin files are required to be at 64x64 despite the fact that every texture in the game can be altered to any multiple of 16. Heck, you can even alter the default skin files for Steve and Alex in a resource pack and have them be at 128x128 sizes. It would make much more sense to be able to upload 128x128 skins if you are able to change the default skin file sizes via a resource pack.
MC-172641
Unable to upload 128x128 skins
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