Black tie is normally worn at formal dinners and balls and where it has been specified 'black tie'. For this you should wear a black suit, which consists of a double or single breast black jacket with ribbed silk or satin-faced lapels, and trousers with a single braid or satin stripe down the outside leg. In warmer climates a white tuxedo jacket is normally worn, so this could be a good idea if you are marrying abroad in a warm climate. Underneath the jacket you should wear a Marcella or pleated white shirt with a classic or wing collar with a black bow tie. You could modernise and co-ordinate more with the colour theme of your wedding by adding more vivid colours of waistcoats or bow ties. Complete your outfit with a pair of black highly-polished plain, toe-capped or patent leather shoes.