ZEGNA's 'Oasi' collection is named after the nature park founder Ermenegildo Zegna established in 1910, kick-starting an initiative for the brand to use fully traceable, European-grown fabrics. These slim-fit twill trousers are made using premium linen sourced from Normandy, France. Wear them with the matching suit jacket and a polo or collared shirt, depending on the occasion.