We're not sure that Starfleet would have signed off on this hairstyle, so it's a good job that Chris Pine didn't have it when he inherited the role of Captain James T. Kirk from William Shatner for the most recent set of 'Star Trek' movies.
Usually, actors experiment with long hair earlier on in their careers, so it's been a surprise to see Pine walking around looking like this in 2019. If the stories are to be believed, though, he grew his hair to better suit his character in 'I Am the Night.'