Female Empire Sovereigns have Kingdom armour

Every Empire sovereign I make that is female, uses the lighter kingdom armour textures. The men seem to be fine. I haven't been able to find the problem anywhere on the Support forum here and there's no missing field in the female sovereigns XML file when I compare it to a male one. The icons come up fine, showing the usual black leather armour for an Empire player, but when worn it's ugly Kingdom brown.

I'm happy to fix it myself, but I have no idea what value is missing or incorrect.