Typically "fake it 'til you make it" is all about pretending to be something you're not. In the workplace, it's less about external appearances and more about emulating the behaviours of successful people.
Photo by Dan DeChiaro
The Harvard Business Review explains why you might want to copy the behaviours of successful people you know:
People who use this strategy concentrate their efforts first on reproducing the behaviour they have observed, even if they don't fully understand it. Then with practice, like Lewis, they try "to get inside the brain of another person." In their minds, they're not being inauthentic -- they're simply evolving so they can get the job done. After a while, they find they have acted their way into a new way of thinking.
We've covered mirroring behaviours before, but here it's more about mirroring a successful person. Sometimes it's just easier to watch and do then to analyse and understand. Check out the link for tips on how to try this strategy yourself.
You're Never Too Experienced to Fake It Till You Learn It [Harvard Business Review]