Totally depends on the company. Some companies insist on "business attire" which for men is a shirt and tie, nice slacks, usually a jacket (depending, again, on the company). For a woman the equivalent would be skirt, jacket, and yes, nylons. Or a pantsuit, whatever those actually are.

Other companies go for "business casual". The definition of this varies from company to company, but for men this usually means nice slacks and a button shirt (sometimes polo shirts are allowed). For women it can be just about anything, but slacks and blouse or skirt and blouse I guess are most common. Jeans of any type are generally a no-no in any "business casual" environment.

The final rung on the ladder is the "casual" office. Jeans and a T-shirt for men and women alike.

But what you're going to have to do is, when you interview, make sure one of your questions is "What is the dress code?" (and try not to look upset if they say it's anything other than "casual" ;-) ) and then you're going to have to ask them to define whatever they say anyway, because like I said, "business casual" can be defined in many different ways.

Probably the best way to judge for real is to be observant when they take you around the office during your interview. If they claim their dress code is "business casual" but you see people wearing jeans, it's probably safe to wear "business casual" for a month then switch back to jeans ;-)

And nylons are cool. To look at, anyway.

-- Dave