Take a close look at the others in the office when you 'walk through' to the conference room.

"Ripped jeans and Concert T's" vs "Suit & Tie" vs "other"

In my experience, the apparel of the others makes a huge difference on how you are perceived. If this is a 'Silicon Valley Garage hacker' wannabe and you show up wearing a full suit you will be ostracized before you open your mouth.

I've gone as far as hanging out at a bus stop near a potential employer and watch how the staff are dressed as they leave for the day, just to get a feel of what average is. Then make sure you dress _moderately_ better then that average.

This could also be double-speak for "you are too old, old man!"