Mod for changing skin?

Do you know of any mod that let you to switch from standard skin in-game to any file you specify? I need this for machinima and skin used there would be used only for that movie so it isn't very wise to set my skin on minecraft.net, especially that I've lost skin that you can see me with in game.

Well you could change the skin only for the movie
http://www.minershoes.com/editor
go there, enter your username on the bottom right and hit Download once its laoded to fetch your current skin