Is this combination of Segmentata/Chainmail armour historical?

[[Legio_VIII]_Caesar_Libo]

Would make sense for cavalry. But I seen a other image of infantry wearing it, plus the image I linked up top is also a roman infantry.
 (heres the top linked image again http://i.imgur.com/xxJqvrQ.jpg)

Sorry for the low quality in this image but you can clearly see that the guy on the left is wearing a segmentata top part with chainmail.  http://i.imgur.com/nUGZaD7.jpg