Loki wears what any warrior from Asgard wears - lots of layers of leather and metal.

He's also got his horned helmet, which is a special symbol of ridiculousness.

Morgana loves his fashion style

AND HE LOVES YOURS MORGANA

Sadly the horns didn't come with him, but he wishes they did.

are they symbolic of anything besides ridiculousness

It's never really stated, but it seems that they're meant to be a symbol of authority.

They were originally drawn by Jack Kirby, who drew most Marvel comics in the early days and loved REALLY crazy helmets

GREEN AND BLACK AND FLOWY IS THE ONLY FASHION SENSE

Loki's was based a bit off a samurai helmet, but more ridiculous

>_> also lots of hair

Need that hair

Although actually Loki wears the helmet so much in the movies because he didn't always have a specific hair color in the comics

Most of the other characters in Marvel had character designs from the beginning, but Loki never did

His only traits that ever stayed constant were the green clothes and the horns

Personally I think the horns denote him as the second prince of Asgard, heir to the heir.

Because Thor's helmet is silver and Loki's is gold, and historically in Viking culture silver was prized way beyond gold.

So it's like having a silver medal in our culture. YOU TRIED!

I'm also glad it's canon that Loki does something to his hair to keep it slicked back. And it's also canon that he wasn't allowed to do it in prison