The Manolo for Men notes that President John F. Kennedy was always ready for a change. Roger Mudd wrote in The Place to Be:
The president stepped aside to let me pass….As I slipped by, I noticed that there were shelves in the space usually used for coats—shelf after shelf of shirts, stacks of freshly laundered presidential shirts. There must have been four dozen of them. Only later did I learn that Kennedy put on a fresh shirt each and every time he deplaned from Air Force One for a public appearance.
I understand Barack Obama uses the time in between shirts to pose for magazine covers.