I thought smart people for a beach are the ladies dressed in bikinis and gents in short trouser beach wears. Oh yes that's right, but there is another perspective.
What do you call smartness? This of the body, not of the brains. Is it the dress code you have in your mind, or the fitness of a cloth for the specific purpose?
If you went wearing jeans in a corporate office you could be advised to go back for a suit. Your not smart. But if you were two, and confidently doing that, you will be smart.
Liken it to this.
Tradition has always discouraged eating along the way, but if you find a gang of stars enjoying those delicious grabs you would love to break the ancient rules. They would be perfect in their fun.
Going to a beach in a full suit with those closed shoes in the water is crazy when he's alone, but it all gets an artistic meaning when she accompanies him in a red long dress.
Maybe they are celebrating an anniversary. But though they don't look beach, their happiness and less concern is an assertion that makes them fit.
you can dress it where it is not known to be.