Had two more ads pop up just this morning, for similar looking companies, they all seems to have similar complaints made, some also have a note from Trust Pilot about monitoring/removing suspicious (I'm assuming good) reviews.
https://uk.trustpilot.com/review/www.damensein.com
https://uk.trustpilot.com/review/airydress.com
Seems from the ads and reviews, that they put up images of nice clothing, jewellery etc..., seemingly obtained from elsewhere, and often at suspiciously cheap prices to hook people in. Then to send out very cheap, badly made and ill fitting copies which, take an age to arrive, if they do arrive.
Given the cost of returns and it sounding like a nightmare to get a refund, they probably think that it's likely a lot of customers will just give up and write off the money, especially for cheaper items.