Meanwhile, in a small bowl whisk vinaigrette ingredients together.
In a large bowl, mix the tomatoes, cucumber, peppers, red onion, basil, and capers. Toss with enough vinaigrette to moisten. Season liberally with salt and pepper and arrange the vegetables on a platter.
Drizzle the bread with remaining vinaigrette and add to the platter. Serve immediately or allow the salad to sit for about 1/2 hour for the flavors to blend.