Gabrielle Union feels most “powerful” when she is naked. The 51-year-old actress – who shot to fame when she appeared in a string of TV shows and films in the 1990s – has a life mantra of being herself at all times and revealed that trait carries over to what she chooses to wear – or not wear – at any given time. She told People: “She said: “Today, I’m in sweats and my Uggs, very L.A. But last night, baby, I had a slit up to my tuchus and a heel, which usually I fight back against the heels. My style evolves daily and I dress how I feel and sometimes I feel powerful in a suit and sometimes! “I…