I buy a bit of stuff from Ebay. Generally I make sure I buy the best brands I can, the ones that I know will wash & wear well (Next, Gap, some designers, but not all, as some fade horribly).
The condition has to be stated clearly in the description and it has to be excellent/like new/barely worn, etc...If it doesn't say that, I will email to ask details.
If the item doesn't match up to the description on receipt I give the vendor the chance to sort it out.
Generally, they'll make some kind of offer. Most are just parents getting shot of their little ones stuff. If they don't, I would consider reporting them to Paypal, for goods significantly different from description, but I'd think about how much it cost me, what should I realistically expect, etc. I haven't had to do it yet.
I've had some good buys, some naff ones...but more positive experiences than bad ones. And I never spend more than I can afford to lose, so if anything does go tits up, I won't be crying into my cocoa about it!
I do like to buy new stuff from Ebay, but only if the price is right...and I ALWAYS consider the whole price...not just the final bid price.
Hope you have more luck in future (if you decide to perservere).