Demand an End to Wrongful Clothing Sizes

I am around 150 pounds (around 68 kilograms according to google) and I am roughly 5 feet and 2 inches (around 158 centimeters). I have been in stores at the mall (specifically Forever 21 and Aeropostale) and I have to buy an XXLarge in order to fit in a shirt decently. I am in size 13 pants. My mom told me that at 150 pounds and 5 feet and 5 inches (165 centimeters) (as a teen in the 1990s), she was at a size 6. Wrongful sizing needs to end. I and multiple girls have tried starving ourselves just so we could fit into a smaller shirt. My sister who is 5 feet and 1 inch and weighs around 90 pounds (roughly 41 kg) can only fit in a large. This needs to end. Could we please try to get Forever 21, Aeropostale, and stores of the like to start sizing correctly?