When it comes to formal occasions, being dressed up is necessary. However, simply saying someone is "dressed up" is a bit too generic. There are many synonyms that can be used to describe someone who is well-dressed and appropriate for the occasion. "Most polished," "most elegant," and "most sophisticated" are all descriptive phrases that can be used instead of "most dressed up." "Most suave," "most suave," and "most debonair" are also synonyms that carry a sense of refinement and class. Whatever synonym you choose to use, make sure it accurately conveys the level of sophistication and appropriate dress for the occasion.