Q:
Missing armor skins?
You need transmutation charges (after any initial ‘free to apply’ function) to change skins on your character’s gear and weapons. You can obtain them in-game in a variety of ways, including City Map completion.
You can learn more about the Wardrobe and its functions in the Knowledge Base (Top of Page – Support) and the Wiki: http://wiki.guildwars2.com/wiki/Wardrobe
Welcome to Tyria, and good luck.
Self Help Administrator
These items come with one free application (which is done with the item itself, rather than through the Wardrobe screen). After that, you need transmutation charges. In addition to the Gem Store, you can also get the charges through various in-game reward systems (see the wiki for more info).