Friendship is magic and so is this costume. The Rainbow Dash Classic My Little Pony TV Girl's Costume. This costume features Rainbow Dash, a popular pony off of the TV series. The costume comes with a dress that has a rainbow striped body, just as Rainbow Dash's mane, and a shiny blue skirt. The skirt features her pony symbol, a cloud and a rainbow lightning bolt. Attached is a cute detachable rainbow felt tail that will really make your little girl look like her favorite pony. A headpiece finishes off the costume and has Rainbow Dash's face on it. Rainbow Dash is the best flier in all of Equestria and is in control of the weather. Make this My Little Pony costume your big gift to your daughter on Halloween.