C.G.
Hi M.,
I have used eBay quite extensively but have lately become a big fan of craigslist.org. They do not charge you to list your items for sale like eBay does. We listed some items and got emails within hours. We sold everything we had listed within 4 days. In addition, craigslits-ers shop local so you can have buyer pick items up instead of shipping if you find it more convenient.
Regarding eBay, what I have found most effective as a buyer is when sellers list LOTS of clothing. So they would group 4-5 dresses together and sell them. Any name brand/designer clothes will likely do well individually.
When buyin on eBay, pay close attention to the shipping costs and the Seller's rating. Some sellers overprice shipping costs to make up for low winning bids. Check for positive feedback on the seller, but also be sure the buyers giving positive feedback are still active and established eBay users. Some sellers will create false accounts to give themselves positive feedback.
Hope this info helps! Happy bidding!