midnight-mystic: "The buyer clearly can't tell what will fit her even with flat measurements provided. This transaction was a waste of time and money for the OP. Why give the buyer a second bite at the apple?
I would absolutely block the minute I read her message about wanting to return. If you feel so sorry for her, then you are welcome to waste your own time and money refunding and relisting."
Well, isn't that a delightful response? If only it were that easy, to just block a buyer after a sale, and make them go away. However, blocking them will only prevent them (maybe) from purchasing from you again, and if you have your settings correct, then they can't send you any more messages directly. They can, however, send messages through eBay--as in, opening a SNAD return when they are angry at being ignored. As much as sellers would like to keep buyers from biting their apples twice, eBay has made it quite clear that they could care less if you are left with only a moldy brown core--when all is said and done. Blocking the buyer isn't going to stop her from getting that return--one way or another. The only thing blocking her will do, is cause ill-will and hard feelings.
Everyone who buys clothing on-line has gotten, at one time or another, something that just didn't fit. Regardless of the measurements provided, sometimes it is hard to make all the measurements line up on an actual human. I recently sold a dress to a woman who stated that the waist of the dress actually hit her around her bust area--it was just a bad fit, and I accepted the return, which took me about a minute, got the dress back and re-listed it, which also took about another minute. In the meantime, I also got positive feedback from the buyer for being easy to work with--something that the OP will probably NOT get if they block, ignore, dismiss, and stubbornly refuse to accept a return from a buyer who did the right thing here, by not being a weasel and filing a SNAD return. I hate returns too--and they are off the chart lately--but what I do like, is my 100% feedback, 5 star ratings, and return buyers who save me as a favorite seller.
This kind of buyer should be courted here--and rewarded for their honesty, or at least given the most basic of courtesies--as in, not being ignored. As it is well known now that eBay will back them no matter what. We want to keep buyers here--especially the good ones--not run them off with rudeness. A buyer wanting to return a piece of clothing that just doesn't fit or flatter, is certainly no reason for any seller to get upset or angry-and it's certainly no reason to treat any buyer poorly. If you decide not to accept the return, then fine--that is your decision. However, before any seller hits that "refuse" button, or before they try to rely on that "blocked" list to actually help in any way, in a situation like this one--they should be aware of the risks. And there are plenty of ways this can easily go South for a stubborn or rude seller.
Hmmmmm, that reminds me ...... back in a minute or five. 
