I created the skin definition file for you to work on.
The zip contains the basics,the dressing room code and the x close button.
If the code doesn't work for your resolution,you will need to download the dressing config and edit only the height.
I put a screen shot in the zip to give you an idea what to change.
Any other skins you want to use,you will need the skin art and the code to paste it to the skindefinition file.
Once you choose the skin in the in game option,you will need to exit the game completely then relog for the skin to take effect.