If you want a 1024 version of these skins you should find these in minecraft moscow or google images. If you want it to change it to 1024x1024 you will need to go to https://www.planetminecraft.com/pmcskin3d/ by copying the link then press edit then press convert to steve full 64x64 then its converted and the demensions don't change then press file and press save to file and edit the skins and make them wear 403 costumes, hats and other stuff and then post to nova skin and there your skin is pos