Peel and seed the peppers, and cut them into ½-inch-thick strips. In a medium bowl, toss the pepper strips, olives, oil, capers, basil, garlic, and ½ teaspoon each of salt and pepper to combine. Season with more salt and pepper to taste, and serve. (The salad can be made up to 2 days ahead. Cover and refrigerate. Bring to room temperature before serving.)