These represent the lack of clothing more than a ‘look’. In the first two caps, Deanna chooses to be naked, but in the next two the Ferengi choose for her and her mother. Ew!
This is a fantasy representation of Deanna created in the Holodeck by Lt. Reginald Barclay which is all kinds of creepy. Plus she’s basically wearing drapes so it’s not even attractive?
It could be a really pretty nightdress, or it could be a drawstring sack. We never see enough to know for sure.