Came across this photo of a Brioni suit and was interested in the waistcoat. Is this simply a double-breasted waistcoat with a low cut? I don't recall having seen something similar before. Is this considered fairly classic or appropriate for business? Can't tell if there are any sort of lapel on the waistcoast (e.g., shawl). Looking to get a new mid-gray 3 piece. Thoughts on seeing if i can commission this sort of waistcoat with it? Wondering if it is more of something that cycles in and out of fashion and would be advised against.