Because she looks AWESOME.

@Millennial Dan  
Fair enough.

@Scrounge  
Nah. Since even her new outfit includes a similar jacket, it’s clearly just a style she likes.

Maybe it’s part of the “everybody always wears the same outfit except on special occasions” thing that happens in cartoons?

Maybe it’s cold.

@Background Human  
Fair point, but I still think that she’s better off not knowing where leather usually comes from.
 
 
Or that there’s also leather made from horses.

@Scrounge  
Well, I don’t know about the one she wore in the music videos, but the one up there was made from magic.

Because nobody told her what it’s made from yet. >:)

@Background Pony #BE36  
I’d love to see her toss the one jacket aside dramatically, only to be wearing the other underneath. Best of both worlds–just like Sunny herself.

I was annoyed that the basic Rainbow Rocks Doll, which clearly inspired the MPiNT/FttA design (it has the pants, though the dress is yellow and pink rather than yellow and blue, and it has open toed shoes rather than the awesome boots) had no leather jacket. So I bought an extra Zecora (a doll I already have) just to take the jacket off and put on the Sunset doll. I also took the earrings and put them on the Zecora pony, since that didn’t have the earrings. So I improved two toys with one.

@The Twelfth Doctor Whoof  
Sunset Shimmer: “Baby hold my jacket and my other jacket while I unleash the fire and the flames on this fool.”  
Twilight: [faints]

@TheAbridgenator  
Good, but not good enough. ;)
 

@Kamazeustra  
NONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONONOshot
 

 
Hey, you were right!

Only the baddest of all badasses wear leather jackets.
 

@The Twelfth Doctor Whoof  

Like just before she jumps Twiley when said princess arrives in Canterlot High at teh start of teh next movie. :P :P :P

So what? Sunny-sun can wear whatever she wants, because Sunny-sun is best everything.
 
I love that she now has two leather jackets she can rip off at important moments.

@TheAbridgenator  
I would actually really love to see them address the fact that Sunset Shimmer’s natural talents include verbal manipulation, mind-games, and putting all her ability scores into Social and Performance.

She’s from Grease, she has to have one

Because good guys can’t ever wear black leather jackets. Right?
 
Oh wait…  

She be all like  

>implying only bad guys use leather jackets

I just love that the entire general sentiment of this comments-section is like “so what? a leather jacket does not make one a bad girl.”

@Background Pony #071E  
THAT’S TRUE! >:3