The garish yellow uniform Wolvie sported in most of the comics has yet to make an appearance in any of the character’s on-screen appearances (indeed, it’s was even joked about in the first X-Men flick).
Now, it could be argued that the movies wish to distinguish themselves from the comic books, and there’s nothing more to the decision to dress Logan differently than that, but James Mangold, director of the popular antihero’s latest cinematic incarnation, has more to say on the subject:
Finding the rationale for a uniform when the character disdains self promotion, why he would put on some outfit that promotes himself as some kind of hero? It’s like Dirty Harry didn’t walk around with special outfit,” Mangold said. “There’s a difficult line to walk. He’s not a showoff, he’s the last one to put on a team jersey. The flesh and blood character is very loyal to that iconoclastic rebel who doesn’t seem to be the first to don spandex. It isn’t something I’ve talked about much. Some fans may be frustrated, but we’re trying to be true to his character. Who knows whether that will change, I cannot verify and will not deny.
That’s what Mangold had to say to CBR on the matter.
And while he doesn’t completely close the door on putting Logan in his trademark spandex, he does seem to make it sound like a pretty unlikely occurence.