Here's why:
* Size standards have changed: Dress sizes have fluctuated greatly over time. A size 3 in the 1930s is not the same as a size 3 today.
* Judy's body type: Garland was very petite, and the dress was likely tailored specifically to her small frame.
* Costume design: The gingham dress was designed as a costume for the film, not a standard garment. It might not fit consistently with modern sizing charts.
If you're interested in buying a similar dress, it's best to try it on and find one that fits your individual body type, rather than relying on a specific size.