Ask HN: Pitching investors, dress attire?

Hey guys, I've read the article posted several days ago about whether or not you should dress as you would normally for an investor meeting, or if you should spruce yourself up a bit. What do you guys think is the general consensus? I think that if you over-dress, it could be just as bad as if you under-dress. I'm the only techie guy of 3 involved in the company, so what I wear will most likely be different than the others. My typical attire is usually DC sneakers, express jeans and a northface shirt/fleece or t-shirt (comfortable clothes) I'm 23, and this is my first investor meeting, and I'm nervous as all hell, since the potential investor is also some-what technically inclined, so I may be asked more questions than the 2 others. This is an anxious/exciting time, I just want it to go well. It's a startup in an industry that's ripe for disruption (healthcare) and I think we're on the right track and this meeting could be "life-changing" if it goes over well.