According to Kmart, "It's More Fun in Your Undies," and I totally agree.
The Australian commercial promotes Kmart underwear by showing people having fun and living it up in their funky undies, while other "boring" people are dressed in formal black clothes.
The commercial, which was created by CumminsNitro, Melbourne, starts with a girl sitting in a cafe reading a newspaper while someone cleans the dirty glass. When she stands up to leave, we see that she is only wearing underwear.
As the glass is cleaned up by a guy in red boxer-briefs, we see more people going about their fun activities in their underwear. By the time the commercial comes to an end, a scooter parks across from the cafe with a big poster that says, "It's More Fun in Your Undies."