I love the ij-hallen, its an second-hand market in Amsterdam, its once a month. If your in the Netherlands I highly recommend going there. I love the terrain where, with its big cranes and halls, its an old shipyard. It is the biggest second-hand market in the Netherlands, 700 stalls. Normally I don't really like flee-markets because most of the things they sell are .. lets just say not for me hehe. But at the ij-hallen they sell such lovely clothes and awesome vintage cameras :) and so much more.
last time I was there I saw a Gemma-jeans, and I bought my shirt.