I think that the difference might be that today's aristocratic costumes and ceremonial garb is largely boring. In both cases they are largely just suits or cock

I think that the difference might be that today's aristocratic costumes and ceremonial garb is largely boring. In both cases they are largely just suits or cocktail dresses. Even the more unique ceremonial garb that does exist (e.g. robes in high church congregations and academic robes) are worn very infrequently today.