They get a few more options. They can wear a colored blouse of some kind that does not necessarily have to be white. And we say that the skirt should be long or just above the knee, but no miniskirts. Women should wear hose and heels they are comfortable in. And again, they need to look professional.
Jewelry needs to be worn in moderation.
If women are going to wear earrings, they need to wear studs, not long dangling things. Hair needs to be washed and combed, and if it's very long it should be pulled up or back so that people can see your face and eyes, and you are not tempted to play with your hair if you get nervous. Then you can concentrate on the recruiter. An interview is not the right time to try out a new pair of shoes or a new suit because you'll wind up distracted during the interview. He's looking at your face and your neckline.