They could in general use more outfits. Our WoL can have up to twenty of them (and I make deliberate use of it too), there's no reason the Scions have to wear the same gear when they're strolling through a city, participating in a festival, enjoying the beach and so on, as they do when they're out in the field.

Also, different outfits for different environments - hot deserts vs. frozen mountains being just the most obvious example.