These are the two helmets and two hats I created for the Fallout: Miami mod for Fallout 4. Both helmets were already high-res modeled, so I just made the high-res for the hats and then did the game-res and texturing for all four.
The white hat is 760 tris, the blue hat is 994 tris, the pickelhaube helmet is 1,774 tris, and the welding mask is 1,322 tris. Each of them has a 1k texture set.
Concept art by Callumn Clayton.
High-res helmets by Flakles.