Sunset knows the magic of Friendship

Sunset's horn manifests itself because I say it should, alicorn wings just aren't enough! It's not as long as her Daydream form's, but I guess it'd be slightly taller than the one Rarity would create?  

Speaking of Daydream Shimmer, Sunset's dress is actually just that, without the cool bits, and a little bit of Twilight's dress thrown in. Shoes are just recolored versions of Twilight's.
/shrug