I'd have to say that we'd be a little put off that someone didn't take the time to make themselves presentable. We certainly do. I agree that you only get one chance to make a first impression, and we dress appropriately. Last time we went to meet a new couple, I wore a nice business suit with a low cut tank shirt underneath (if you've got the cleavage, you might as well work it
) and Mr. went dressy-casual in khakis and a well-fitted dress shirt. Unbuttoned at the neck & no tie, of course because we like to skip the formalities and appear approachable (which we are).