With three kids I have been selling children's clothing on eBay for 6 years. EBay is an excellent place to sell used kids clothing and also to buy clothing.
The first thing to do when getting ready to sell kid's clothing on eBay is to get good pics of the clothes/outfits. Put the outfits together, have a neutral background, make sure the color on the picture is not washed out by a flash (taking pictures in the daylight will help). I take many photos so that I can go through each digital pic: crop, rotate, and choose the best looking photo. Put a bunch of articles of clothing together, all the same size, and list it as a large Lot of clothing. I put more than one outfit/or piece of clothing per picture. The fewer pics will be cheaper for you, the more pics the more you get charged.
Search EBay for similar items listed, or completed items that have sold. Find the ones that have sold for the most and use a title similar to that auction. Also if any of your clothing is a name brand try to include the name brand in the title. Things to include in the title are: 1. LOT (Put this in the title when selling more than one item, people do search for lots) 2. size (make sure to put the size of the clothing) 3. name brand (include this to draw more people into looking at your auction.) 4. pc (if it's a large lot include how many pieces it is, example: 20pc lot)
Also include anything that may make your items stand out, capitalize important words in the title.
Above I have listed some important steps to take when listing clothing on EBay. A couple other good ideas is to not start your auction out too expensive, the cheaper you start it, the more likely people will bid, and when others see an auction with bids they may check it out over one that does not have a bid. If you are thinking of starting an auction for $10, do not do this! It is cheaper for you to start an auction with eBay for $9.99 (make sure to check out their listing fee chart when pricing). If you do not have a scale to figure out what to charge for shipping, look at similar auctions with the same amount of clothing and charge a comparable price to those auctions for shipping. Always be specific!!! The buyer will complain if they do not know everything up-front, if the clothing is in good condition but may show some wash fade put it in the auction. If it is from a non-smoking or pet free home also put that in the auction, buyers do look for this and are more likely to bid if it is stated in the auction.
Good luck with your auction listings!!!