Teenage females in the U.S. are changing when it comes to the types of clothing sizes they are purchasing, according to the 2015 Women’s Special Sizes Study from global information company The NPD Group. While there has been a sizeable decline among U.S. teens purchasing in the junior size category – from 81 percent in 2012, to 73 percent in 2015 – the percentage of those purchasing plus-size clothing has grown almost two-fold – now 34 percent, compared to 19 percent in 2012.