I don't know how fire damage works but it would be nice to have a suit that completely protects my pawns and makes them not panic if possible. But I don't know how fire code works so it may just not be possible.
theres firefoam poppers in vanilla,
firefoam grenades / firefoam belts ( mods ) and firefoam mortar shells
You could probably adapt the Shield Belt code to protect from Fire. Although I dont know about stopping panic, that might happen after they stop taking damage or you might need a Harmony patch.
Someone made a Firefoam belt,
https://ludeon.com/forums/index.php?topic=37787.msg388934#msg388934
maybe adapt this to extinguish the fire right after the pawn caught fire.
So you can craft a full body cover suit, with these integrated firefoam.
But the suit should be rather expensive.