In preparation for this week’s new episode of @OrphanBlack, we chatted with Costume Department Set Supervisor Peter Webster to get an exclusive inside look at what sets the clones apart fashion-wise. Click through the gallery for the behind-the-scenes details about what goes into creating the three main different looks, and to find out why Peter says “the differences between Sarah, Alison, and Cosima are stylistically worlds apart.”

Catch an all new episode tonight at 9/8 C on @BBCAmerica!