http://www.blacktieguide.com/ is inconcluvie on this as it states... Suspenders (or "braces" in the UK) are always worn with a tuxedo. This is not just a matter of tradition but also of style as Dressing the Man points out. Braces raise the trouser waistband to prevent a gap between the waistcoat and the pants and they align the trousers' pleats and the waistcoat's points. Unlike belts, they do not create any extra bulk along the waistline. Formal suspenders are always the button-on variety, never clip-on. The Indispensable Guide to Classic Men's Clothing states categorically that black tie braces should be white. The Encyclopedia of Men's Clothes dictates that they should be black. Most other formalwear authorities say nothing at all on the topic. Ultimately, the answer is irrelevant because suspenders are underwear and as such are never meant to see the light of day. (This is but one of the many reasons that a gentleman never removes his jacket at a formal function). With that in mind, a man is free to indulge his whims and don any colour or pattern that suits his fancy. What is the board's stance on this? Black or white? For the record, I'll be wearing a turndown collar shirt with a 1B peak lapel DJ.