Monks in p&p are limited to a couple weapons all of which are substantially inferior to their unarmed attacks by about lvl 6 or so at the latest, which is probably 15 minutes into the Monk's life in DDO ( :P ). There aren't any special monk items that need to be introduced in terms of game effects added. Nunchaku are bludgeon damage, which is already covered by the monk's fists. Kama gives the monk slashing damage. There's nothing that needs piercing damage afaik, everything that is vulnerable to piercing is vulnerable to either slashing or bludgeoning. I believe that one of the Codemasters' reports said that damage enhancing gloves are not going to be added, which is good. It sounds like the monk will be getting enhancements and Qi power stuff to cover that anyway.
Clothing appearance customization in general would be a good thing; its not something I consider monk specific. Anyway, ,the Keikogi is specific to japanese and japanese influenced martial arts. Monks, martial and otherwise, in other parts of the world didn't dress that way.
I don't know if 'broken' is the right word for the Monk's belt, but lame certainly is. Class features should not be given out via items. Its bad game design. Oh, and in DDO there are a lot of robe wearing rangers, either archers or finesse builds (or both).