SKIN SETTING INSTRUCTIONS IN THIS RESOURSE PACK
 1.Download the texture pack for the version you need(IN 1.6+ IS RESOURSE PACK)
 2. Open the zip folder and go to the mob folder(IN 1.6+ assets/minecraft/textures/entity)
 3. Replace steve.png file with your own (beware, your skin must be named exactly steve.png and must be 64 x 32!!)You will notice that if you display the large icons, you will see a gray texture with the text "change me"
4.Paste the texture pack into the folder...\Roaming\.minecraft\resourse packs(not the texture pack) 
5. Enjoy your skin in the old version of minecraft