Minecraft Skin Fix is a simple Python socket server that runs on a local machine to redirect requests for skins and capes on old versions of Minecraft (for example, Beta 1.7.3) to the modern skin and cape APIs.
//TODO
-Dhttp.proxyHost=127.0.0.1 -Dhttp.proxyPort=80
Tip
Make sure you have Python installed on your machine first!
//TODO
You can modify the code to have manual exceptions to redirect certain player skins to others, and the same with capes.