I've been asked out on a date by a lawyer who is 10 years older than me. He asked me to wear a lowcut shirt?

and a short skirt for this date. It is our first. Normally I don't dress like this but have qualms about whether I should. I'm not uptight conservative but I'm not a floozy either. What do you think is the best was to approach this so that everyone's comfortable and I don't lose his interest.