What do you think of this? Top button undone and tie loosened.
Just watching an old series (Silks). Obvs, barristers wear suit & tie. All the men in the series with a few exceptions dress this way. Women are similarly dressed in skirt suits + buttoned-up blouses with tights and heels.
Younger male barrister is in his (shared) office reading his notes/working on his files with top button undone and tie loosened. In the next scene, he's in the pub with similar deshabille.