Italian frilled veils?

I'm sitting on a train from Washington DC to New York now. I visited the National Gallery of Art in Washington just a few days ago, and spotted a lot of frilled veils in the Italian painting galleries. So, they definatly did exist there, in contradiction to was is commonly believed.

Madonna and Child Enthroned, c. 1420, Gentile da Fabriano, Marchigian, National Gallery of Art, Washington DC

Saint Ursula with two Angels and Donor, c. 1455/1460, Florentine, National Gallery of Art, Washington DC

Madonna and Whild with Angels and Cherubim, c. 1460/1465, Matteo di Giovanni, Siennese, National Gallery of Art, Washington DC

The Crucifiction with the Virgin, Saint John, Saint Jerome and Saint Mary Magdalene, c. 1482/1485, Pietro Perugino, Umbrian, National Gallery of Art, Washington DC

These are only four examples of the many I found. Also the Metropolitan Museum has some examples in their collection. I will post some more later.