The classic film "The Godfather" taught us that when it comes to business, sometimes you've got to go to the mattresses. In other words, go to war with your competitors if need be, and above all show no mercy. Antonio Tailor Shop, tucked away within a small outdoor mall along 3rd Avenue, prescribes to a different business model where being a friendly face and a good neighbor results in a thriving business minus the bloody horse heads. The tailor is one of many found in the Downtown Chula Vista area and specializes in alterations on most garments, including wedding gowns, suits, and jeans as well as custom dressmaking. In fact, there's another tailor just a few doors down from the shop offering similar services. That hasn't lead owner Luz Maria Gonzalez, or Lucy as her friends and regular customers call her, to use cutthroat tactics a la Vito Corleone. "There's no competition," said Gonzalez, 58, who has been in business in that location for 3 1/2 years and a professional tailor for 2