Description from original post (created 2010-07-10 04:14):
This actually works.
1. Make your HD skin, this is the same as making a HD terrain file. Ive got up to 256 x 128, but I haven't tried higher.
2. name it "Char" and place it in the Minecraft client jar.
3. disconnect from your internet.
4. play the client.
5.
I also changed the char2 file in the jar to the same size, but that might not be necessary. This doesn't work online, as you cant upload larger textures to the online server.