Line a greased 9x13 pan with bread cubes; set aside.
In a skillet, brown sausage with the onion and green pepper; drain. Stir in pimientos; sprinkle over bread.
In a bowl, beat eggs, milk, worcestershire sauce, mustard, salt, pepper and oregano. Pour over sausage mixture. Cover and refrigerate overnight.
Bake, covered, at 325 degrees for 1 hour and 20 minutes. Uncover and bake 10 minutes longer or until a knife inserted near the center comes out clean. Let stand 10 minutes before serving.