If you have a 7 day return policy well that answers you problem but being a male i would want to see the "bust" pictures to make sure lol good luck.

Actually it depends on how she's requested the refund. 

Did she open up a Return Request? 

Was the reason, It didn't fit?

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@thefashiondepotau wrote:
Hello

Need advice, buyer bought a two piece outfit and was delivered on the 6th March. I have a 7 day return policy. Reason for return top doesn't support bust. Unsure what to do, not obliged under consumer laws to change. I have given measurements on listing.

Can anyone help?

Cheers

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Because the buyer's request is within your return period, and your listings (the ones I looked at anyway), say that returns are accepted within 7 days - I'm sorry but that actually means you are obligated under consumer law to accept the return (because the second you say returns are accepted, you oblige yourself legally, and 7 days, buyer pays return postage were the only conditions for return that I could see). 

With eBay's set-up, if you don't want to accept change of mind returns, you actually have to have 'no returns accepted' on your listings, because this doesn't interfere with a consumer's standard rights (i.e. they still have the right of return for faulty items, then it's up to you to decide if you want to allow change of mind returns).