I believe (since she's asking for currency in pounds) that they're in the UK/Great Britain so a size 12 to them is a size 10 in the US. I could be wrong though. I have no clue what the brand is and vanity sizing is rampant so there's no way of knowing the true dimensions of the dress. I thought the same thing at first though. Not disagreeing with you, just throwing in my unneeded two cents.