If I've got an important set of meetings that I'm going to be at it's always going to be a kilt (with appropriate vest as well, everything snazzy needs vests) or a full suit.
If I'm going to something where I know I'm going to need to be social, it's always the kilt. It's amazing how much a kilt is just a segue for other people to talk about their "scottish or irish" heritage; talking about myself is terrible, but listening to the 10,000th person today talk about their boring ass family tree is great (the convo will eventually turn to something interesting or the person will wander off). It also makes me extremely memorable and findable, so I don't have to initiate most conversations which is also a terrible, horrible thing.