Oscar de la Renta. Versace. Alberta Ferretti. Roberto Cavalli. Elie Saab. Christian Louboutin. Zuhair Murad. Ashish. The list of the designers who have made looks for Taylor Swift’s Eras Tour, which began just over a month ago in Arizona and ends in California in August before heading overseas, is like a mini-tour of fashion weeks, replete with sparkles, chiffon and a message tee.