Environmental Armor

Environmental armor was developed for use in heavily contaminated environments, and is prized in the wasteland for its ability to protect against biological threats.

Eastern Brotherhood of Steel Knights are sometimes dressed in Environmental Armor. This protects them against radiation, chemical and biowarfare agents. Of course, it also helps with the Brahmin smell.

Appearances in games
Environmental armor appears only in Fallout Tactics. It is described in J.E. Sawyer's Fallout Role-Playing Game, so it might have appeared in Van Buren as well.