They'll never add an appearance tab. It's been talked about a lot in the past already.
The reason they'll never add it, is that it would completely undermine their Orange Gear system, which they've stubbornly stuck to in order to mask the nearly useless-by-comparison crafted gear system of theirs.
In short, an appearance tab would force them to rework the entire crafting system from the ground up, which they have neither the will or the manpower to do.
btw, I'd love for them to add an appearance tab...