I guess it depends on your clients. Suit and tie might not make a tatoo shop web site client comfortable. Know your clients and co-workers.

My SEO Dress Code is as follows:

1. Each weekday I am usually working in my underwear until I am adequatly caffienated.
2. Meetings : Tastefully Casual, Always Clean
3. Speaking Engagements : Same as #2 but add a tie.

I haven't worn a suit in 5 years and no one seems to mind. The moths are happy though as last month I looked at my old fancy suits and noticed something has been eating them.

The rule of thumb for me is to be comfortable in the way I choose to dress. That way I am not self conscious and I perform better; kind of the way I optimize Web pages, that is, be NATURAL.

Robert

To the originaal questions:

1. Going in to the office?
2. Meeting with a new client?
3. Speaking at a conference/event?"

My "natural" answers:

1. Home office in my case, so Casual.
2. Suit and tie. Professional, always.
3. It depends on the nature of the conference/event.