Loki costume differences.  
Shoulder pauldron is missing. No strap across his torso. And the wide shoulder pads are gone. Its closer to what it was in Thor.
Pics from Thor2, Avengers, Thor Loki costume differences.  
Shoulder pauldron is missing. No strap across his torso. And the wide shoulder pads are gone. Its closer to what it was in Thor.
Pics from Thor2, Avengers, Thor Loki costume differences.  
Shoulder pauldron is missing. No strap across his torso. And the wide shoulder pads are gone. Its closer to what it was in Thor.
Pics from Thor2, Avengers, Thor

Loki costume differences.  

Shoulder pauldron is missing. No strap across his torso. And the wide shoulder pads are gone. Its closer to what it was in Thor.

Pics from Thor2, Avengers, Thor