4 places
Although it is a flea market, the Waterloopleinmarkt is closed on Sundays. De Bladerdeeg, a Greek restaurant, is a nice stop for a break.
Regulars say that the best days to go are Thursday and Friday. However, on Saturdays and Sundays you might find more specific or rare pieces that are only available on the weekend. Ask for Marche-aux-Puces.
Monastiraki is a marriage between what is fake and what is real. For those who know quality, wandering through Monastiraki is not a hopeless endeavor, as it may appear on the surface.
On weekends, Sydney's Paddy's Markets feature clothes. There is also Paddy's Swap and Sell Market, Australia's biggest undercover garage sale with over 250 stands selling almost anything.