[MMM]

I can understand getting nearly a 100% response if your pool of respondents was "young" as you said. They don't like wearing yukata, either.

There are appropriate times and places to wear such things. Outside of those situations, it isn't appropriate for anyone, foreigner or not, to wear them.

I wore traditional garb when I participated in a a danjiri matsuri in my town. My Japanese buddy and I then wore the same get-ups to a Halloween party in our neighborhood. The hosts were jokingly P'O'ed because our "costumes" were "too cool".

At the appropriate situations, I have never heard of hints or even rumors of Japanese thinking foreigners wearing Japanese traditional clothing as inappropriate or strange. If anything quite the opposite. I know people who would tell me exactly what thought about every other situation, so, again, I find this harder to believe with people over the age of 25 or so.