David O'Brien, proprietor of O'Brien Auto Performance in Tulsa, said his shop plays Irish jig music during the work day and has a shamrock in its logo, so switching his summer garb from pants to a kilt four years ago seemed like a logical way to cool off in the summer heat, KOTV, Tulsa, Okla., reported Thursday.
"This is physically cooler than shorts," O'Brien said.
He said the mode of dress comes with its own challenges.
"Keep your knees down and your feet crossed, then everybody's happy and safe," he said.
O'Brien said worker David Denney followed his lead and also dons a kilt at work from May to October.
2014: The Year in Music [PHOTOS]