Keldorn's armour is A/C 0 actually, but only Keldorn should be able to wear it. Allowing a monk to use it (assuming he/she has the needed stats, 17 con 12 Int etc) was obviously a mistake on Bioware's part.
I can see why someone playing a low level monk would want to use it, but as monks have to be lawful they should really be above such chaotic exploitation.
