Ermenegildo Zegna's blazer is a good choice if you've a destination wedding or summer business travel on the horizon - it's unstructured and only lined through the sleeves, so it's really airy and lightweight. It's been tailored in Italy from a breathable cotton-blend and garment-dyed a smart navy shade. The profile is slim, with notch lapels and a simple two-button close that'll gently define your waist.