|The following is based on Van Buren and has not been confirmed by canon sources.|
The environmental suit a piece of clothing that was to appear in Van Buren, the canceled Fallout 3 by Black Isle Studios.
The outfit is worn by human slave traders, which the player has a good chance of running into on their way to, or coming from, the Reservation Trading Post.
It is mentioned in the Boulder design document, and the Reservation design document.
The environmental suit was to appear in Van Buren.