On Monday, IndieWire revealed that over the holidays, Netflix recorded its biggest Christmas week in company history, in large part thanks to Bridgerton, a show that reached over 63 million households. But the streaming site’s new Regency-era romance-drama, produced by Grey’s Anatomy’s Shonda Rhimes and based on Julia Quinn’s romance novels of the same name, didn’t just bring in a record number of views. It also caused a spike in popularity for fashion from the era it takes place in — which fashion search engine Lyst has dubbed “Regencycore.”