Taylor Swift uses no product. She lets her hair dry naturally and touches it up in the morning with a curling iron.
To get the same effect, wash your hair and don't put anything in it except maybe a frizz serum or some coconut oil. Comb out your curls and let them dry overnight. In the morning, use a 3/4 inch spiral curling iron (this is what Taylor Swift uses: a spiral curling iron is different than a regular curling iron and produces a different curl) all around your head and hairspray lightly. Since you curled your hair on its natural texture it will usually hold the curl all day. don't forget heat protectant.
I've done this a couple times and people have told me it looks exactly like Taylor's. Good luck
2c/3a, fine texture, normal porosity, medium-to-thick
Co wash: Vo5 Extra Body
Conditioners: Deva One Condition, GVP CB, Loreal Evercurl
Stylers: Devacurl ArcAngel, KCCC, AG Recoil, Iso Bouncy Creme, Ecostyler Krystal, CCCCL, KCKT
Low Poo: Devacurl NoPoo, GTTT
Hair likes: plopping, diffusing, SMaster's, coconut and argan oil, honey, protein
"What makes a woman unforgettable? Her mind...surrounded by lots of naturally curly hair"