I am meeting him in his office on campus. I am a master's student in computer science. I figured that suit and tie would be too formal as it isn't really an interview since I already have the position. If I were just regularly attending grad classes, I may wear T-shirt, shorts and flipflops (during the summer/fall) and jeans, polo, light jacket, sneakers during the cooler months. Should I wear khakis, dress shoes, and a nice button down shirt? Ties? Yes or no? I want to make a good first impression but not have it look like I'm trying too hard.
In addition, he invited a few other grad students to his house for a cookout next weekend. What should I wear to that? I'm guessing more on the casual side but should I go in shorts/t-shirt or jeans/polo?