Please explane this

This article isn't the problem, it seems like a very useful experiment.
NASA to fly material testing experiment on X-37B spaceplane
The question that I have is about the two people in this picture:

The suits that they're wearing aren't designed to keep contaminants away from the X-37B.
They're over pressure suits with a re-breather designed to keep contaminates from entering into the suits.
Here are pictures of cleanroom suits for comparison.
NASA to fly material testing experiment on X-37B spaceplane
The question that I have is about the two people in this picture:

The suits that they're wearing aren't designed to keep contaminants away from the X-37B.
They're over pressure suits with a re-breather designed to keep contaminates from entering into the suits.
Here are pictures of cleanroom suits for comparison.