Did you watch this, Raoul? The second person pictured in the video has .... visible bra straps!
It's a good NO modesty video, for Trads you'd have to step it up a bit.
I think that while well-meaning, the second woman in the video is dressed somewhat sloppily. I think that she's actually wearing some kind of camisole or tank type shirt and then a loose, ill-fitting sweater over it. Tops other than bras can have spaghetti type straps.
The whole impression, while technically exposing some shoulder and chest area, is not one of allurement, but careless dishevelment. And that fails in the area of decorum and modesty in a different way than someone trying to seduce by appearance, IMO.