An entire spacesuit is really a feat of engineering! A spacesuit is essentially a small anthropomorphic spacecraft.
The Russian Orlan spacesuit used on the ISS does have a special and uinque feature. To notify the cosmonaut (Russian astronaut) of a life support malfunction, a buzzer alarm is heard by the cosmonaut through their spacesuit helmet. This prompts the crewmember to view a digital display on the wrist of their suit which changes colour from green to orange and recommends a course of action. An example would be if there is a pressure leak or drop, the instructions to fix this would be depicted. It’s a feature that would be useful for future astronauts exploring the surface of the Moon or Mars!