Continuity mistake: Series 1, Episode 9: Primal. As Carter and Taggart are crawling through the access tunnel, the torch attached to the side of Taggart's goggles is pointing downwards, below his line of vision as established by the lenses on the front. As the shot changes to a close-up on Taggart, the torch is now pointing forwards, aligned with the lenses. (00:13:50)
Revealing mistake: When we first see the army of Starks outside Global Dynamics, it's quite obvious that only one of them is actually the actor that plays Stark; the others are merely people who look similar.
Chosen answer: It's basically just a type of suit that's made for whatever special project they're working on. No different than a lab coat, hazmat suit, fire coat, etc.