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Sister who bought a gift for me post wedding, a branded hoodie(not cheap) size Small . I rather prefer Medium as it's fits a bit looesly rather than having it snug.

She has no Reciept or provided a gift Reciept. Just expected it to be the correct size. Although I did find out that she asked about my size and was told I prefer it loosely fitted.

She however ignored and still got the size she deemed correct in her mind as. I have spoken to customer services and they can't do anything without a Reciept or any kind.

AITA If I ask her for a bank transaction screenshot as thats the only alternative that would allow me to exchange sizes. In UK this is acceptable.

Mind you she is very private with regards to her finances and me asking for this might make her feel uncomfortable.

Although, I'm a little annoyed she knew the size I like to wear for this particular garment.