Biagiotti has been working in Scala di Milano for some years in costume design for productions with G. Strehler, L. Ronconi, and F. Zeffirelli. She has also worked with Piccolo di Milano, Regio di Parma, Teatro Verdi di Trieste, La Monnaie di Bruxelles, Opera Stadt Köln, English National Ballet and Metropolitan Opera. In 2008, Biagiotti designed costumes for Tosca directed by F. Zeffirelli in Teatro dell’Opera di Roma’s production, for which she was awarded Cinearti La Chioma di Berenice international prize for Best Costumes for an Opera Production. Biagiotti joined Teatro dell’Opera di Roma in 1989 and became the Director of Costume Department in 1994. She was also costume designer for Opera Hong Kong’s Aïda in 2007.