Consider which accents to use. If you have all of the items already mentioned, you're basically already set. There are a few additional accents you may want to consider if you really want to take your look over the top, though.
Choose the right shirt studs and cufflinks. The shirt studs and cufflinks should either match each other or complement each other. Avoid mixing silver and gold metals.
Also consider wearing a pocket square. Pick out something that will match your personality while remaining classy, and make sure that the color and material complement your date's dress instead of clashing with it. If all else fails, though, a plain white pocket square is a safe choice.