Hey! I've been an Ebay seller of children's items (mostly clothes) for the last 4 years. I'm around 630 feedback right now, and profiting quite nicely. It takes a while to find things that really sell for you. I just skimmed by for the first year, hardly making a profit (if at all). Then I found out what really sells *well*, and now try to only sell that. I've also learned many tricks of the trade of being an ebay seller, but am still learning (I don't think it ends - there's always something new to learn there!).
I will have to put out a BIG word of caution and disagree with ANYONE who thinks selling baby clothes is profitable. Even those boutique brands mentioned sell for such a piddly profit in baby sizes. I don't sell ANYTHING under a 2T, with only a few exceptions... I'll sell most smocked items, Hanna or Zutano (I will usually only sell these if they are grouped together as a set/outfit or a couple similar outfits). Though it is hard to pass up a like-new Catimini baby outfit, if it only ends at around $10, what the point? There's just not enough profit there to cover my listing fees, paypal fees, as well as time spent cleaning, ironing, photographing, listing, dealing with questions, and preparing for shipping. Infant sizes are just SO easy to find, that 1) not many moms actually NEED these clothes and 2) the market is saturated with them.
Okay, that being said ... there's many more brands besides those that a PP listed that will do very well. I hate other people's lists

. Mainly because what sells for one person might not for you. You just need to find what brands sell well for you. My best advice is at first to only buy things for resale that could also work for your children. So if you get it home and do an ebay search (make "completed auctions" be your new favorite search on ebay) and it doesn't sell well, then nothing lost, because your DC can wear it. Or if you notice alot of a certain brand and it looks like it might sell, go home and do a search on ebay and see if it's actually selling, before you invest your money. You'll get the hang of it and start to find what sells well for you fairly soon. Don't invest much money in things you are unsure about selling.
I don't sell mall brands (gymbo - with some exceptions, but hardly ever, gap, ON, TCP, etc). I only sell boutique.
My best ebayin' tips: buy a postal scale (sold on ebay

). This will allow you to give accurate postage rates, as well as ship from home. If you're selling children's clothing, offer a First Class postage rate (as opposed to Priority). Buyers ARE turned off by high shipping rates. Most children's clothing can be shipped for less than the $4.00 of priority. Take good pictures, and put them on the gallery. And finally, if you're serious about this, go visit the Children's Clothing Discussion boards on Ebay. They are heaped full of great info from many seasoned sellers.
I'm not bragging, but we do well enough with ebay and gpt's (ebay being the majority) that we vacation every other month just with those profits

Feel free to pm me any time with any ebayin' questions!
Follow Mothering