HELLOSUMMER
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A good variety of suits from as cheap as $107.10 delivered (pants & jacket) - It's free shipping as well.
They have free returns if you are worried that it wont fit. I have bought a suit off asos and it was good, I ended up getting the pants tailored a little to make it fit better but it ended up much cheaper than getting a suit in store, plus I like the styles.
returns at your cost to a NSW address.