His shoes?
On the episode 'Large Blade', towards the end when they are all in the office waiting to meet the new boss. Can anyone identify Mac's shoes by the bottom of the soles that are visible while he's sitting with his feet up? What kind/brand of shoes? The shoes had a cool looking design for the tread, like a picture.
Had the episode on the DVR but it got deleted before thinking of trying to read the credits for any kind of wardrobe info.