Marketing anything on these websites, of course if it is legal. These sites will sell your items to the greatest bidder, then you will have to ship the things towards the customers yourself.
*Most auction sites often impose a fee to list and sell the things, but you can sell them pretty fast though and when you think about it, it's really worth it, considering the fee isn't excessive when compared to the cost of your clothes, so you will certainly earn profits.
*When you list your items, make sure you up load an image of all your items on the market. That saying holds true, "A picture is worth a 1,000 words", you might want to take advantage of this and employ a digital camera to up-load your pictures.
*It's extremely important for the picture to appear natural or possess a natural lightening into it, so it would look more like the item itself instead of fake looking.
You need to show people what they're buying, if the natural look isn't there, then once they buy and get the items they are most likely going to return the product and ask for reimbursement, since the items they seen on the website didn't look identical to the item they received.(It would be the same item however the pictures will make it look different)
*Make sure you choose an acceptable price for the items, you want to ensure the price you select may be worth the buy, you don't want to charge too much for used items, sufficient to sell them. Try browsing around the site to check out other items like yours as well as their prices to get a rough idea things to charge.