The term ‘Smart Casual’ not only allows for multiple interpretations but also, implies that, there is something called as, un-smart casuals, or as I like to call it, an old pair of lounge-at-home PJs. Nothing wrong with those, but it isn’t great to wear them outside for anything longer than a milk run.
Smart casual implies clothing must be spiffy i.e. improve our outward appearance, and yet superbly comfortable. Imagine a suit which fits like a glove but caresses like a tracksuit. It’s the dressing that you can play catch in at the park and yet walk into a bar afterwards and still be up to the dress code. Smart casual, easy as it sounds, is not always easy to get right.