You wear a tuxedo for explicitly formal occasions. A shirt with cuffs and without buttons and so ... cufflinks ar perfect for that. And they may well radiate some luxury and class. For your cufflinks, choose a version in the same precious metal as your watch, possibly combined with a gemstone or diamond as an extra eye-catcher. Cufflinks with the wearer's initials are also still popular. The ultimate cufflinks are of course custom made, made according to your own design or with a personal engraving.