He totally stole the costume from the set.
And frankly, he deserves it. The project has been "in the works" for over a decade. He and director Tim Miller have been working all that time to make sure they deliver the best possible version of Deadpool they can. And judging from the trailer, they're going to deliver. F-yeah! (Via).
So, what's the first thing you'd do if you got to run around dressed like Deadpool?