Ray-Ban 2140 Wayfarer - Taylor Swift - 22
The sunglasses have a black frame and the lenses are not polarized, otherwise a small "p" would visible next to the Ray-Ban logo on the lens.
The Wayfarer is one of the most popular sunglasses frames, see more Wayfarer sightings in movies.
Reference: Ray-Ban RB 2140 Wayfarer - Color: Black (code 901)
In the same music video, Taylor Swift is also wearing Red Heart Sunglasses.