It's gonna take some time for more clothing to become available, smudge. There are over 40 different species of pets in Neopia, which means over 40 different templates for just ONE clothing item. There also has to be extras of each clothing item for pet colors that don't conform to to the basic shape of the pet, such as Baby or Maraquan. I don't know if they'll bother making clothes for older-style pet colors that didn't get converted into the new forms (Faerie Peophin or Darigan Blumaroo, for example), but if they did, that's going to be even more work.
Even back in my last post when I was talking about the shirts and how it might be the quickest thing to start with - I didn't mean it would actually BE quick. Just faster than trying to make, say, pants that fit every pet.
Add to the fact that TNT's working on a crapload of other things at the moment - the new plot, fixing (well, should be fixing) numerous glitches that have come out since the site revamp, getting previously announced items released, etc... basically that amounts to a good long wait for practically everything.
They'll all be announced, don't worry.
Personally, I can't wait to see some more hats active. My Hissi's been dying to wear the Twisted Roses Seasonal hat she got a couple years ago. XD And I'd love to be able to put that funky Colorful Bruce Scarf on my Mutant Bruce!
I also wonder if other things that aren't categorized as clothing now would eventually be made wearable as well, such as the backpacks in School Supplies, some of the bracelets and barettes in Grooming, and some BD items like Mystic White Cloak and Heavy Robe of Thievery.