I am about to commission a new dinner suit (see DJ with Brisa thread elsewhere), and I was discussing with my cutter the open back waistcoat with built in braces, like in this illustration:

Image borrowed from member Midnight Blue who is the author of the Black Tie Guide site.
I am interested in Model 682 and Model 660, one in same material as suit, and the other in white pique. Would like to solicit member's thoughts on which to be black and which to be white.
And if any member can share the pattern of either the braces built in type or just plain open back style. Sator, perhaps?
Many thanks in advance.