The report confirmed that "as best man, Mr Burley purchased the costume alongside the flights and other costs associated with the trip on behalf of the other attendees.
"Mr Burley argued strongly that the choice of costume was inspired by the British comic association with aspects of the war," it said.
"He categorically denies that there was any political motivation whatsoever.
"He argued that the purchase and wearing of the Nazi costume is legal in the UK and that he was unaware that wearing the costume could be an offence in France.
"He regrets the offence caused by the wearing of the costume."
More top news
Police are responding to an incident at Manchester Arena and have said to avoid the area.
ITV News travels to Britain's eastern-most city to gauge how the electorate will be casting its votes.
Carefully choreographed campaigns can become unstuck because voters have the power to peel back a politician's veneer.