Here is my video on every reused costume on Dance Moms. I am going through each season, so this video is just season 2 only.

Introduction - 0:00
Episode 1, "Everyone's Replaceable" - 0:06
Episode 2, "Return of the Candy Apples" - 1:15
Episode 3, "Brooke's Turning Point" - 1:36
Episode 5, "Brooke's Back" - 2:36
Episode 6, "Jill on the Rampage" - 2:57
Episode 7, "Bullets and Ballet" - 4:35
Episode 8, "The Runaway Mom" - 4:57
Episode 10, "Miami Heat Wave" - 5:18
Episode 11, "Melissa Pleads the 5th" - 5:59
Episode 12, "Waiting for Joffrey" - 6:40
Episode 13, "Abbygeddon" - 7:20
Episode 16, "I Know What You Did Last Competition" - 7:42
Episode 19, "Worst Birthday Party Ever!" - 8:03
Episode 20, "Guess Who's Back?" - 8:25
Episode 21, "Break a Leg" - 9:06
Episode 24, "New Girl in Town" - 9:27
Episode 25, "Solo Fever" - 9:49