For armor skins, I find it’s best to browse the PvP locker. This will let you look at individual pieces of armor — allowing you to mix and match, or see what an armor set looks like with shoulders/head hidden (unlike armor images on the web, where they show the full armor set all the time).
There are many sets that don’t match their PvE names in the locker, and some sets that are not named uniquely (two “leather” sets in the PvP locker, for example), so if you find a set you like and want to know its PvE location, I’d recommend a screen shot along with the PvP locker name.
To get to the PvP locker, click the PvP icon at the top of the window, and choose “Go to the Heart of the Mists”. If this is your first time there, you have a tutorial of sorts available — though you can do what I did and skip it by just running straight across to the Asura gate. This is a one time thing for your account, any further characters will go straight to the Heart of the Mists. Once there, go to your right — a bit behind the gate is a trio of lockers where you can store PvP armor. And more relevant here, you can preview each piece, including weapons and cultural armor.
