@feld @sampo wearing formal wear for diplomatic events is a tradition from way before US existed, this was always about both showing respect to everyone else and not allowing yourself to be looked down upon. It used to be formal court wear in the past, then a peculiar style of clothing specifically used for diplomacy, military uniforms before finally settling on suits and other formal wear. Dressing like a bum weakens his position and only serves as a PR move to look good on photos - and you can be sure this level of self-serving chafes anyone who talks to him.