He worked as a "Brodeur ordinaire du Roy" in the court of Marie de Medicis of Florence, second wife of Henry IV of France.
Vallet made botanical illustrations, along with Jean Robin, for the Le Jardin du tres Chrestien Henry IV (1608) with plants from the garden of the Louvre Palace along with exotic curiosities from West Africa and Spain.
Vallet was born in Orleans and moved to Paris where he worked as an embroiderer under the patronage of Marie de Médici of Florence (1575-1642), the second wife of Henry IV (1553-1610).
We know that the Jardin du Roi, the Jardin des Plantes of to-day, was expressly established under Henri IV, by the gardener Jean Robin and by Pierre Vallet, the king’s embroiderer, to provide the embroiderers both male and female with new models inspired by exotic plants.
"[3] Vallet also illustrated Jacques-Philippe Cornut's Canadensium plantarum published in 1635, and Les Adventures Amoureuse de Theagenes et Chariclée Sommairement Discrète et Representee par Figures (Gabriel Tavernier, Paris, 1613),the hero and heroine of an erotic 4th century romance in Greek by Heliodorus, Bishop of Trikka.