The imp fix procedure can also be used if Grisha does not bring up a dialog option about the dragon armour (though this problem appears to be much less common then that with Sir Patrick; it has occurred just once, that I know of).

Here is the dialogs.000 file (16KB). I went straight from the dwarven king to Sir Patrick, so you may have to talk to Grisha a couple times, once to get the description of the dragon armour, and again to tell him you have the pieces. Make sure you backup your original file and restore it afterwards, as described above.

Save your game under a new name, backup your dialogs.000 file and replace with mine, re-load, talk to Grisha, wait awhile (1 game day, IIRC) then talk to him again to get the completed armour (without talking to anyone else about quests, or doing parts of any other quests), save under a new name, delete the dialogs.000 file in that folder and replace with the backup of your original file, re-load.

You may need to re-load a few times to get good stats on the armour. If you have a potentially good set, move it in your inventory and save the game first if you want to keep trying. If you get something crappy, you can also just buy back the original from Grisha (though you need the fixed armour to show the king, and wear the complete set once).