woman standing at mirror

I remember a painting of a woman standing between 2 mirrors so that her reflection seems infinite. Her dress looks sort of medieval. She is wearing green, and I think that she is pregnant. Or I may have her confused with the woman in the Arnolfini portrait, but this woman is definitely between 2 mirrors. I think that I saw the painting in a book approximately 40 years ago, so the memory is fuzzy. Can anyone name it?