A business suit is a great option for women, too. Women have the versatility of choosing either a pair of dress slacks or a skirt, with a business suit jacket. As long as your slacks are formal dress pants and look professional, they are acceptable.
You should avoid informal-type pants such as jeans, sweat pants, leggings, spandex, or shorts. If you choose a skirt, it should have a comfortable fit that looks attractive without being too-revealing. It's always safe to choose a skirt that hits the knee.