It comes after the photos were posted by Swift and Kansas City Chiefs tight end Travis Kelce in their engagement announcement on Tuesday.
Swift wore a cream and black silk-blend dress by Ralph Lauren.
Selling for just under $320, all sizes quickly sold out on Ralph Lauren's website.
The celebrity couple made the engagement announcement in concurrent social media posts.
ALSO SEE: Everything to know about Taylor Swift's engagement ring from Travis Kelce
The post reads: "Your English teacher and your gym teacher are getting married."
The post received tens of millions of likes.