Just a thought: I had a very interesting trip around the Centre for Aviation Medicine at RAF Henlow last summer, and they were talking about their attempts to get something WW2-looking but safe for the BBMF pilots to wear. All the available 'leather-look' options failed their tests - the kevlar shells were hard but there was insufficient padding between the shell and the pilot's skull in the event of a crash.
So stick to something boring but safe...
Tim