What is the sample size used in showrooms(fashion agencies)? How to start a fashion agency in Australia?

I am starting a fashion agency and I have to make my first order of clothing(swimming suits) overseas to import. But I do not know which size is the one commonly used in showrooms(fashion agencies). Can anyone help me please? any tips about how to start a fashion agency?

Size 2 is the most common size .

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I think it's a size 8.

sample sizes are size 8 aus and size 2 us although that is the same size lol