My wedding will be in June, 2012. It's going to be an outdoor wedding, morning or mid-day-ish. Very light feel, not extremely formal... think garden party/brunch wedding.

My groomsmen will be kilted, along with me (the groom) and my brother-in-law who will be the officiant. Should I opt for a Prince Charlie jacket? An argyle jacket? How should I differentiate between me, the best man, and the groomsmen?

Any advice will help. I would like to hear everyone's opinions so as to have as many options to think about before making my decision. Thank in advance.