The clues may be with the jacket itself. Any information regarding the manufacturer, date, labels, markings, size, damage, where it was handed over and by whom etc... might help to determine the theatre of war, Europe, Pacific, Far East therefore narrowing down the search.
We already have one candidate:
'Ye Olde pub' crew members
Sgt Samuel W. 'Blackie' Blackford, Ball Turret...
But there are many others, example:
"John L. "Blackie" Porter — a former stunt pilot — is credited with commanding the first organized air rescue unit in the theater. Known as "Blackie's Gang" and flying out of Chabua, India, they were equipped with two C-47 aircraft. One of their first rescue missions was the recovery of twenty people who had bailed out of a stricken C-46 in August 1943 in the Naga area of Burma"
Every little bit of information helps