Can't quite figure out how to get my skin changed.
When I was doing it earlier you could take off a cape or put one on, and the entire skin will change.
When I try to select a skin from my computer there is a good chance that there is a side or part missing. (May be issue with source, however unlikely when the same source was used on another skin and it worked.) 
There are other issues in the skin department as well, such as skin missing all together.