Don the Lennon glasses. Sean Lennon is normally seen in the classic circle-rimmed spectacles. Picture Harry Potter meets John Lennon. This the first key for anyone who wants to dress like him.
Dress like Sean Lennon by wearing smart-looking suits without a tie. He tends to leave his collar open under the sport coat. You can try the look with a tie, but he tends to only wear a tie if he has the vest on under the suit's coat.
Go casual with a printed vintage t-shirt and corduroy or dress pants. You can also wear band tees to dress like Sean Lennon.
Wear fun colored shirts with your suit choices....