Board Thread:General Discussion/@comment-199.255.1.20-20130207142822/@comment-1672596-20130207143333

Yuji Koreikado and Kojima Productions stated that the armor that he was seen wearing in the prologue for Rising was in fact a modified version of his suit from MGS4, and besides which, it's even implied in the TGS trailer to be wearable, at least regarding the hands (Raiden was shown to have normal human hands when in that business suit, yet when discarding the suit to adopt his armor, he was shown with the cyborg ninja arms).