Short answer — Australians shop for clothes online at a mix of local fashion specialists, big department stores, discount/fast-fashion sites and large marketplaces. The most common destinations are:

• THE ICONIC — Australia’s biggest pure-play online fashion retailer (wide range of brands, fast delivery, very high traffic). (fashionbi.com)
• Local high‑street/fast‑fashion chains with strong online stores — Cotton On (and its group brands), Country Road/Politix/Seed, Kmart/Big W for budget basics. (en.wikipedia.org)
• Department stores with large e‑commerce operations — Myer and David Jones (popular for mid‑range and premium labels). (en.wikipedia.org)
• Global fashion sites that serve Australia — ASOS, Zara, H&M (popular for trend styles and international brands). (reuters.com)
• Low‑cost offshore marketplaces that have grown fast — Shein and Temu (major recent share gains among Australian online shoppers). (news.com.au)
• General marketplaces and resale platforms — Amazon Australia, eBay, Facebook Marketplace, and growing second‑hand/resale sites (Vinnies/Salvos online, Depop, local resale services). These are widely used for both new and pre‑owned clothing. (news.com.au)

Notes on why people choose each:

• Speed & returns: THE ICONIC and big chains emphasize fast delivery and easy returns. (fashionbi.com)
• Price: Temu/Shein/Amazon compete on very low prices and broad selection. (news.com.au)
• Range & brands: Department stores and ASOS/Zara offer premium and international labels. (en.wikipedia.org)
• Sustainability/resale: Online op‑shops and resale platforms are growing as alternatives. (theguardian.com)

If you want, I can:

• give a short list of the top 10 Australian clothing websites by traffic, or
• suggest the best sites by budget, style (street, workwear, high end), or delivery speed.