Using my sexuality for business advantage

One of my male colleagues accused me of unfairly using my sexuality for business advantage. My job requires me to meet clients, usually men, and its most often in a dinner date at a nice restaurant. I have no physical contact with them other than a handshake. I always dress according to the company dress code for women- except perhaps for hem length. Here's an example of what I usually wear. To be honest I have to credit the gold dress with a few very successful client meetings.



I think this accusation is sexist and misogynistic. What else would I wear for an occasion that is both business and social?