Well, if we're dealing with fire, including heat resistance in the reinforcement should work... or some sort of fire repellant, but that would take longer to set up.

If we are going that route, might I ask a favor, then? My particular brand of magic is more effective if we set up workshops of sorts, and those are most effective in locations with a decent amount of space but solid walls and few windows. If you could make arrangements to reserve a place like that for me and leave some armor you'd like me to work on there, it would expedite things a bit.

From the way it sounds, working with someone who works with the water element would be for the best here, though I'd be happy to discuss things with all of them.