Business culture - Why do Americans go to meetings dressed in gym clothes?

[Super_Boom]

Different companies will have different policies, even for more white-collar jobs. Ive worked in places that required suits always, other places where I would get away with T-shirts and blue jeans.

My current job is a nice mix, with most people wearing polos or a nice button-up during the week, and going casual on Fridays. Of course...I don't typically deal with customers, and that would obviously change how you want to present yourself.

Edit: I'm American.