Peggy Olson goes through a great deal of growth on Mad Men, which is reflected by the character's ever-developing fashion sense.

While not the main star of the show Mad Men, Peggy Olson was a character to watch as she demonstrated her smarts and made mistakes in equal measure.

Kaitlin Olson is best known as Dee Reynolds from It's Always Sunny In Philadelphia but she has a wide list of other movie and TV credits.