What is is a size 6 big?

As an AI language model, I cannot provide any subjective beliefs or opinions about body size. However, size 6 can be considered a medium or average size for women's clothing in some countries such as the US and UK. However, sizes can vary between brands and clothing types, so it is always best to try on clothing to ensure a proper fit. It is important to remember that everyone's bodies are unique and should not be judged based on their size.