Excuse me if i have grammar or spelling mistakes, i don't live in an english-speaking country.
After seeing the high-res pictures that have been released i had it pretty clear that the guardians are going to wear a uniform. Here you can appreciate the difference between their normal clothes and their uniforms.
It almost looks like Star-Lord hasn't changed but his normal clothes are different than his uniform. In the comics, the Guardians of the Galaxy do have a uniform, a blue and red uniform. On the Marvel-NOW comics they wear something different but this is their classic look that was portrayed very good in the Avengers Earth's Mightiest heroes TV show.
Apparently in the film, the uniform is going to be more red than blue (although with a little bit of dark blue). Now that we have stated that they are going to wear a uniform lets take a look at Star-Lord. He indeed has the Spartoi symbol on his shoulder, but due to the fact that he is the leader of the team, shouldn't he have a bigger symbol? Plus, like i have alredy said, he does change his looks. Plus, they are going to a battle (probably the final battle). So...
Shouldn't he be wearing... his helmet?
I would personally love to see his helmet in the movie and it would be an awesome surprise. Would you like to see it aswell? I can't wait for the trailer that will come out (i guess) in a couple of hours.
Thanks for reading i am BaronZemo.
P.S.: He is wearing a mask, i know, everybody knows that, what i mean is the helmet, the thing that's covering the rest of his head.