By Aksakalko / Getty Images As strange and surprising as it may sound, walking down the street in underwear is the latest fad among many celebrities, fearless of the cold and of standing out. A simple picture of Kendall Jenner has turned this new fashion obsession into a real trend on social networks, to the point of becoming a major inspiration this new year. As strange and surprising as it may sound, walking down the street in underwear is the latest fad among many celebrities, fearless of the cold and of standing out. A simple picture of Kendall Jenner has turned this new fashion obsession …