Return to the center of the city and head to piazza Navona. Then turn to the street of the Old Government - via del Governo Vecchio. Here you will find several second-hand shops. To a large extend all the shops sell almost the same things. In these small, dim shops with freaky sellers you can find old, smelling a bit waxy Barbour jackets, Burberry trench coats that lost their color due to the time, glasses, hats and shoes.