It has to be her legs, I wish I had legs like hers
For me, it was her voice before I ever saw Taylor, when she released "Teardrops On My Guitar". I initially pictured a totally different person, someone with dark hair.
But her singing, songwriting, sense of humor, etc., also won me over, almost song after song [I admit I don't like all of her songs].
In 2012 Taylor came out with music video " We Are Never Ever Getting Back Together", and the new largerness of her breasts [and the rumor of breast (and later butt) implants] got me again. And the music video "I Knew You Were Trouble." cemented it for me at the time.
I'm on the fence about Taylor's Pop-over-Country style. While I'm not a Country fan I miss the "old Taylor" ["Oh, she's dead," New Taylor informed us"], while on the other hand I love her new body-baring attitude as well, and the songs aren't bad [but don't *feel* like Taylor].