Short answer — it depends on your style and budget, but these are the best Australian (or Australia-friendly) sites for men’s fashion right now:

• THE ICONIC — Best all‑rounder for Australians: huge selection across price points (basics → designer), very fast AU shipping and free returns policies. (theiconic.com.au)
• MR PORTER — Best for international designer/luxury menswear (ships to Australia; strong customer service and premium delivery options). Use it if you want high‑end labels. (mrporter.com)
• David Jones — Best if you want an upscale department‑store assortment and designer drops in Australia (good for premium brands and omnichannel service). (davidjones.com)
• Myer — Good department‑store option for broad menswear ranges (accessible premium + mid market), often runs brand launches and sales. (ragtrader.com.au)
• Thrift/secondhand options — if you want sustainable or budget finds, several Australian op‑shop platforms and charities now sell online (growing alternative to fast fashion). (theguardian.com)

Which to pick (quick guide)

• If you want convenience, fast delivery and the biggest selection: THE ICONIC. (theiconic.com.au)
• If you want luxury/designers and don’t mind international shipping: MR PORTER. (mrporter.com)
• If you prefer in‑store pickup, premium department‑store brands and sales: David Jones or Myer. (davidjones.com)
• If you want cheaper or eco options: check Australian online thrift/op‑shop marketplaces. (theguardian.com)

If you tell me your budget and preferred style (casual/street, smart/casual, formal, workwear, sustainable), I’ll narrow to 2–3 specific stores and highlight the best current deals or brands to look for.