This is a set that is a must for that Harry Potter fan in your family. Fun 2 piece set with short bottoms and short sleeve top. Lightweight fabric for a comfortable feel. Black 100% Polyester bottoms with an allover "Up to no Good" print and a the top that features the text " I solemnly swear that I am up to no good" written in a silver foil. For questions regarding sizing, please refer to size chart.