Willow Easter Egg- Taylor Swift's "Evermore"

Life was a willow and it bent right to your wind

Invisible String ties to Willow music video

In the willow music video, it shows Taylor following a golden thread through adventures and eventually it leads to her lover. In Folkore's "invisible string", the whole theme is how things work in mysterious ways and the lines "all along there was an invisible string and "a single thread of gold tied me to you" See what I see? Taylor Swift is a genius! Evermore is the "sister album", so naturally she tied the whole story together.

Also, the cardigan

It appears as if the willow music video starts just where the cardigan one left off. It's kind of obvious, but she starts cozy in her cardigan and then goes on another adventure. To take it further, maybe the whole adventure was to find her lover, which happened in the end :)