Morihei Ueshiba, of course, changed all kinds of things - including etiquette, protocol and dressing, and it still seems to have remained budo. For that matter, if you can't change things without Aikido dissapearing then it has already dissapeared, because nobody, not even the Iwama folks, trains just the same way that Morihei Ueshiba did.

All budo, for that matter has changed, and continues to change, over time. People don't wear quite what they used to wear, they don't behave quite the way that they used to behave. Things move on.

Practicing a martial art as a way of life has very little, IMO, to do with funny clothes that people didn't even wear 100 years ago anyway.

Best,

Chris