Not suitable. There are two reasons. First, for friends, both newlyweds and China are used to wearing new clothes. How can they use other people's clothes? Second, for you, it is a souvenir when you get married. Why give it to others unless you have to? If your friends don't have very, very serious financial difficulties, suggest that they buy a new set and keep yours, so that both parties can see their wedding souvenirs in the future.