Madrid’s fair-haired child, Agatha Ruiz de la Prada , brings her happy palette and upbeat designs to her new space in Tribeca/Soho . This is her first New York store, and if ever there was a place to buy an umbrella, this is it. Barcelona, Milan and Paris are fond of her free-wheeling spirit, and now we can add a dress or two to our fashion vocabulary. She brings a sense of the Nicky de St. Phalle to her clothing collections, merging her sense of the haute in the art world, and her practicality for urban Moms.