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For an overview of various models of power armor in the Fallout series of games, see Power armor.
The following is based on Fallout PnP d20 and has not been confirmed by canon sources.
According to the canceled Fallout d20, the Eastern Brotherhood power armor was based on a commercial variant that was available briefly before the Great War.
I would redo the sprite of the Power Armor to make it more retro. Not that there is anything technically wrong with the sprite, it's a great piece of art. It's just that it is a bit out of place in the Fallout Universe. But bear in mind that we had to design it over a year ago and Interplay approved everything we did. - Tony Oakden, producer of FOT (Freelancer interview)
Why does the Power armor look so different from previous models? - Different group of BOS, different technology. - Ed Orman (Freelancer news)