Just popped into the PTS to have a look at this, as it's something I've been wanting since beta. There are a few relatively simple things they could fix that would make it more useful.
First, add a "hide shoulders" option. I would prefer most of the light armor styles without the awkward looking oversized epaulettes. "Hide stupid-looking hip flaps" would also be nice, but would require some pretty major artwork revision so I won't push that any further.
The other thing is, apparently you can only select the styles that each character has learned individually? This severely limits customization for my seven alts who have not learned the motifs I've given to my main/crafter. Why not make this account-wide instead of tied to the individual character? Or better, do something like they do in LoTRO and Rift, both of which have very good cosmetic tab features, and let you drop items from your inventory into the cosmetic slots? Then your crafter could make a generic grey version of whatever style you wanted to wear and all you would have to do is transfer it into your alt's inventory.
As well, I actually prefer some of the tier one and two versions of the standard racial styles to the more ornate later tier styles. For example, the tier one Imperial light armor looks, to me, better than its tier 5 version. The above suggestion would also solve that problem.
If Zeni would implement those two things, I can see myself using the outfit tabs quite a bit. But as it sits on the PTS, I'll stick with my costumes.
Walking Dead survival tip ... just run faster than Otis