Although I don't know what kind of situation you are talking about, the following methods should help you:

First: If you think this dress is of good quality and cost-effective, then you can stay and wear it. Is the brand of the dress important?

Second: if it is a gift, it must have a trademark, and then change the receipt into a marked one.

Third: there is another one. Maybe you didn't buy pure products, but other brands sold in pure stores. Many merchants sell together with some other brands for store turnover.

In short, the quality and workmanship of the clothes are good, so stay and wear them.