I’m sure that is an actual whole dress, but it LOOKS like an extremely incomplete one with a t-shirt tossed under it to pull it all together. I don’t know what’s happening, and I shouldn’t have to frown so hard; it’s CLOTHES, not a doctoral thesis on what is up with the YouTube comments sections.
The good news is, Claire Danes should keep her hair like that forever, because the gentler color really suits her. The bad news is, the dress. The good about THAT is, presumably she took it off later and won’t have to deal with it again.