The Bangkok Market is also home to a used clothing and shoe section. Here you will find every product is different and each item is a different size. Much like charity shops across the world, these items are donated to stall holders and are either no longer wanted. Chatuchak Market's used stores normally specialise in a specific range of products like Levi Jeans and used trainers and can be picked up for very cheap. Expect to pay around 200-1000 Baht per item.
This is the place to go if you want to find yourself a bargain. It is complete luck of the draw, but lookout for designer gear in amongst other items.