Given his current lifestyle, Warren had decided that simply pulling a long unworn suit, dress shirt and silk tie from the back of his closet, all of it tailored to allow for his wings, was close enough to an alter ego. He certainly wasn't likely to be any kind of businessman ever again.
"Shall I be some sort of angelic accountant to your demon?" he asked Jay as he stepped up next to him. If Jay had been the one wearing the suit he might have suggested Aziraphale to his Crowley.