Look online for a full list of wearable clothing. I can't list them all here. If you go on one of the sites, there should be some clothing that has the word "uni" in it. They can also wear any other type of clothing, except those that have other neopets' names in them.
neomall
* All neopets can wear wearble clothes
A fantastic list of what neopets can where what on neopets can be found at http://www.neopets.com/~Echoh .
http://neopets.com/~oreanos
There are a lot of Neopet wearable clothings, too many to list. However, there are some sites that have lists of all Neopet wearable items. If you would like to see one look in related links.
You can only get wearable items from the NC Mall.
go to http://www.neopets.com/~Echoh
The main ones are potatoe sacks and piles of dung. But most wearable items are only available through neo cash.
Go to sunnyneo .com they have all that... Des
any items that can be bought by neocash or in your newbie pack or backgrounds can be equipped on to a Lenny
The Weblink listed below keeps an updated list as to what items a Kyriis may wear.
Go to that items drop down menu in your inventory. (Make sure that it is wearable). If it is a wearable, there should be a button saying 'Put in Closet' or something. Huzzah!