Infinity Nikki and Combat outfits

I've noticed lately that Infinity Nikki prevents the use of the pulled 5 star combat outfits during certain quests, like fighting the slug dragon for Izaland, and now during the most recent banner when you go and do the quest with Angert for Mothis dungeon, it's once again preventing me from using my own chosen combat outfit. Anyone know why infold does this? It's frustrating and makes getting the combat outfits feel kind of pointless if you can't even use them during the big combat scenes. Is there a way to change this at all, or am I stuck using the base combat fit for all major quest lines?