If I look silly wearing just a shirt and a tie so be it. I often wear this look to class, when i go shopping, or out for drinks on the weekend and don't see a thing wrong with it. Who wants to walk around all day with their jacket on unless they need to? If it's what you like to wear, then wear it. Make your own fashion rules and don't lsiten to somebody elses. I'm sure I look better in just a shirt and tie than some forum complainers due in their best suit.