by geographic region, day of the week and industry.
In
general, people in the East dress more formally, while people in the West are known for being a bit more casual.Executives usually dress formally regardless of which part of the country they are in.
Casual Friday is common in many companies. High technology companies often wear casual clothes every day.
For an initial meeting, dressing conservatively is always in good taste. Women can wear business suits, dresses or pantsuits. Men should wear a business suit unless you know the firm to be quite casual.