Well....I am pretty much a social faux pas, but its not for lack of trying!
However, husband's ex dresses like you describe and she doesn't have the figure for it. She just turned 42. She's lost some weight, and might be down to a 16 now, maybe (she wears everything skin tight)? But she routinely wears "wife beaters" and slits the neck so they will expose even more boob than how they are originally designed, with spandex bottoms. easy child 2/difficult child thinks that is "pretty", so my assumption is that's what mom thinks is pretty. She dressed the same way in high school and was sent home repeatedly to put on appropriate attire, but she thinks that's just funny. Apparently, in her mind, that's perfectly ok to wear.
The second one...not sure. My first thought was an adult difficult child that knew they had to sit in a particular place to stay focused/"get" the lesson. But the eye rolling doesn't fit that scenario. Or maybe she's an Aspie and it does. I dunno. Or maybe she's just a sister-beulah-better-than-you that just needs her noggin whapped a few times. lol