Next time your feet get cold, you might just ask a nearby female Marine if you can borrow the socks hiding out in her hair. Yes, that’s right. The secret behind the ladies’ uniform hairstyle is out — she has a sock in her hair. Maybe even two. And to get that bun looking smooth, she probably used enough hairspray to transport anyone back to 1989 via a giant cloud of aerosol. A hot-off-the-presses Marine Corps news release details how to “sock it up,” so you too can get that hairstyle that will set you apart from no one and…