If you listen to Brian Tracy he says to dress like a business owners advisors would, e.g., their accountant, banker, estate planner, etc. A "consultant" is an advisor, which kind of implies that you should wear a tie if you're a guy or a suit of some sort if you're a gal. However -
My guess is most will say they dress "business casual".
So which is better?
One reason I think you can get away with business casual is because of our field. Marketing. It seems creative types can even get away with being a little eccentric if they want to.
Also, is the type of client a factor? For example a "mom and pop" store vs. an upscale client? Or say a Doctor, Attorney, etc., etc., ...
Or does it even make a difference?
Rural community vs metro could also be a factor. Hard to imagine wearing a suit in a rural area but maybe I'm wrong.
Any definite research data anyone knows about on this? ("this" being all of the above)