No, for whatever reason no mods for armour have ever been made for this game. Except if you're only looking to change the appearance. In that case google 'black suit with golden skulls/dragons'. You'll come across a nice mod that gives Geralt's leather jackets a much better looking appearance.
There are plenty of "make the game easier by adding end game items at the beggining of the game" mods.Try second link in first post of this topic: http://www.thewitcher.com/forum/index.php?topic=16346.0It adds all Raven's armors, Ard'aenye, Aerondight, forged sword from 3 yellow meteorites + 1000 orens in Frightener's body to loot