I’m lucky in that I can actually wear jeans and a t-shirt and sneakers to work. We don’t have dress codes at my office. I’d actually feel kind of awkward in “dress clothes”.
It’s a Swedish thing I think – or maybe because it’s an environment chock full of engineers and programmers. And a metal work shop that build what the engineers and programmers think up on site.
And I also rarely have any customer contact. But if I do I usually just spruce it up with a cute/pretty top and stay in my jeans.
I am an engineer too after all – I can get away with it. ;-)

And thanks for considering me a Gen-Y. It makes me feel young and hip still ;-)