In the Series 5 episode "A Witch In Time", Piper travels back to before they first saved Miles. When Phoebe runs into the building to look for Miles, she is wearing black heeled boots. After future Piper gets out of the car and Piper and Phoebe run to save Miles, Phoebe is then seen wearing flat-soled brown suede boots. She is seen several times wearing these boots but when Phoebe runs towards Miles (after he is shot) Phoebe is back to wearing her black boots.