I have been playing in Strangerville, trying to solve the mystery. I have gotten so far as to acquiring the Hazmat Suit with the Filter, but my Sim will not wear it. When I click "Wear Hazmat Suit" th...
You can clic on the image in the inventory or clic on the sims. Did you try both ways? May be the game didn't "register" that you had the hat. I would go back to see the scientists and see if you can ask for the hat again.