This may simply be due to the game still being unfinished, but I noticed that for sovereigns, Gauntlets and Shields seem to take up the same 'costume' slot.
Essentially, you cannot wear Gauntlets, and have a Shield on the same Sovereign. (This likely applies to troops as well, but I haven't tried it yet.)
Is this intended, or are the Shields just a placeholder?
I really do hope eventually I can have both; but didn't know where else to put this.