That we both can agree on.What the video says to me is that he is deeply engaged in what he's doing. In an intimate setting like this, his smile, his technique with tuning, even just the way he rocks his body, all telegraph this. I'd say he's dressed appropriately--nothing should draw attention away from what he's doing on the instrument.
But the subject is "clothing style on stage".
His playing is the performance.The show.
Not his wardrobe.
Play your bass like a boss and no one will paying attention to your clothes.
icon implies I wear cargo shorts at gigs, and no one will stop me! (Well, I do where jeans if it's freezing you $$$ off weather....)