Also, I think people are blowing this way out of proportion... I think there MAY be a difference in how Thor wears his costume between when he's being crowned King of Asgard and when he's hanging around casually at the Helicarrier.
Several things... Firstly, whilst Thor's armor in the movie looked great in fight scenes etc, it did NOT look that great when he wore it capeless, in some of the more casual, Asgard scenes. The chain mail made him look very stiff and limited in his movement. This costume looks more relaxed and casual, for the actor as well as making it seem bit more earthy and real.
Secondly, in both the licensing the recently released concept poster, Thor has his chainmail and his cape. The mere fact that in this photo, he isn't wearing his cape when we KNOW he has his cape, clearly suggests that he isn't in his full battle outfit.
Seriously, it is nothing worth getting ones knickers in a knot over.