Wearing your kilt to other cultural events

[Archangel]

Disrespectful?

Wearing a swastika to a Polish festival would be disrespectful.
Wearing a Turkish military uniform to a Greek festival would be disrespectful.
Dressing as a Nazi at a Jewish festival would be disrespectful.

Wearing a kilt is not disrespectful.

Which shows more respect, wearing your national or cultural garb and showing pride in your heritage and culture, in a place and time where others are doing likewise, or wearing a costume?

Don't take too much for granted. To some, kilts are the symbol of imperialism. Kilted troops were the face of British military power for many years. People from those countries remember.
I have a friend who is a refugee from near Basra. The (non-kilted) Black Watch were there. They did not use the regular British markings, the Saltire was prominent instead of the Union Jack. He will be identifying the foreign troops as Scottish, in fact, that's what they labelled themselves.
This is no slag on the Black Watch, a regiment I highly respect and have family connections to. It's a recognition of a shared feeling, how I would feel about any foreign troop walking around, armed and in control, in my country.

(p.s.: please don't take that last comment anywhere. I am aware of the current situation. I am not commenting on that, or trying to initiate conversation on that. I am referring to Scottish troops being seen as an unwelcome force for social and political change and not an affirmation of our clothing choice.)