Are slacks appropriate to wear to a funeral?

I am going to a funeral tomorrow and was planning to wear black slacks and a dressy shirt with nice shoes. I just searched Fluther to double check that I don’t have to wear all black (The Collective came through), but there were several admonitions about not wearing slacks. The only nice dress I have is the one I was married in and I really don’t want to wear that to a funeral. Are dress slacks appropriate or should I borrow a dress?