A ballerina skirt is a pretty skirt that is full and fluffy like a tutu that ballerinas wear when they dance. It's so fluffy because there is a lot of tulle fabric in the skirt. Tulle is a special type of fabric that is very light and flowy. It's like when you blow bubbles and they fly around in the air, but the bubbles are made of fabric that's called tulle! Ballerina skirts are usually made with many layers of tulle which makes them puffier. They come in many different colors and are usually worn with tights and ballet shoes. So, when ballerinas dance, they spin and twirl, and their skirts fly around them like a beautiful flower opening up. That's what makes ballerina skirts so special and pretty!