How would you have responded?

My husband was best man in a wedding yesterday. I attended the wedding and reception in a classic "little black dress". During the reception, the bride approached me and asked me why I wore black ( a funeral color) to her wedding. I told her that black isn't only for funerals, and that I don't have many "wedding clothes" in my closet. Keeping in mind that my husband spent $100 on his tux, and that we gave them a nice cash gift with a card. I couldn't help but feel that I chose to wear something that the bride saw as inappropriate to her wedding. (The groom is mid 50's, and the bride close to 50.) I'm wondering if I responded appropriately, or if I should have said something different? I can't imagine saying something to a guest that would make them feel the way I did. Years ago, a comment like this would have prompted me to leave immediately - but at my age (51) it just irritated me.