[derefr]

I'm guessing that there is a cognitive divide here, between:

1. people who apply for jobs they see ads for, by just doing the phone screen + showing up at the interview; and

2. people who know someone who works at the company, have heard stories of how the company is, see people from the company getting lunch around town, might have even informally asked the person-qualified-to-make-hiring-decisions whether they're hiring--and then go through the interviewing process.

In the latter case, you obviously know exactly what the dress code is like before getting there.