O'Donnell said 41,000 pieces of clothing were bought each week on Trade Me. More than 2.1 million items were bought last year, 62 per cent from professional sellers. In March, the most popular women's Trade Me clothing search nationwide was for Country Road, then Karen Walker, City Chic, Nike and Witchery.
Trade Me shoppers could pick up a Karen Walker silk slip top this week for $20 or worn-once shorts for $95. New Karen Walker shorts in the latest Utopia collection sell for about $150.
Men typically look for Nike, Adidas, Huffer, Icebreaker and I Love Ugly.
O'Donnell said there had been considerable growth in "vintage" clothing over the past year.
"That's become really fashionable."