"I have nothing but adoration to add here ...”
As an enormous fan of sarcasm, i think there is a very good chance Billie is making fun of those who approve of this style.
Showing that the way she dresses normally is not what she's left with, or a phase, or trying to fit in with group X, but an actual choice made.
Kind of like Picasso. Look at his early art, he had the skills to produce what most would consider 'art.' So the stuff idiots say, "My 9-year-old draws better," no. It's not tgat Picasso failed, you do.
She's not a model, so she should not be judged so heavily on looks, that's not her job.
Plus, weaaring this dress got yhe designer to stop using fur. What have YOU accomplished with your Sunday Best...?