Suit, but DH's suit is a very staid, plain black, the same thing a store-bought tux would look like, just without the velvet or silk lapels and buttons. It was a good investment, suitable for weddings, funerals and cruises. My two sons have plain black jackets, and an oft replaced-for-length pair of black pants. I made bow ties and tuxedo-cut-away vests from a Vogue pattern for fomal night, worn with white shirts, very tux-like. The boys and DH looked great. They wore regular shirts and ties for semi-formal night. Takes very little fabric to make the vests and they were co-ordinated!
Carla