I am attending a professional conference next week and the first event is a "welcome" cocktail party at 9 p.m., On the guest list are several clients and dignitaries. I am wearing a slim fit medium grey suit and want to use it on the first night. What should I wear as a shirt/tie combination? Should I even wear a tie? I am thinking of an Armani black dress shirt under the medium grey suit, no tie. Salesman at Louis Vuitton says I should wear a lavender dress shirt under the medium grey suit, unbuttoned, no tie. Wifey says stick with white shirt, burgandy tie, black monks. I want to stay dressed in a suit, but don't want to look like "that guy" at business conferences who tries too hard to look "casual" in a business suit, but ends up looking like well, an uptight guy in a business suit no matter how many shirt buttons are unbuttoned, or what kind of pastel shirt he wears under his suit jacket. Thank you for your opinions and sincere advice.