In general, if you want to be taken seriously, show as little skin as possible. Look neat and put-together with no flapping clothing. If you don’t have a great figure, (for example, sag) cover it up. If you are fat, wear black. And, if you wear jewelry, make it small. Dangles and bangles look like they belong on an African bushman.
As for deportment, an example of how not to do it is Justin (dress-up-and-dance-like-an-idiot) Trudeau and Beto (skateboarding) O’Rourke. What jokes they are.
As for livestreaming an a beer (which you have obviously never had before) at home or a tooth cleaning at the dentist; No.
I mean.....surely this woman has access to professionals who could pick out flattering clothes? And you are correct, black is classy & can be accesorized. Her husband looks embarrassed.