I too wonder about bicycling and motorbiking in a kilt (yeah, I've read through some of the old threads on the topic) -- and before anyone says "don't" -- they must realize that my situation is Japan is a little different than back home in N. America.

In Japan (like much of Asia) getting around by bicycle or motorbike is the de facto standard for getting around -- especially short distances, which tends to be my case. I would not wear my kilt on a long ride (especially when there's high speeds involved) but here we're talking like 10 minutes to the store or 20 minutes to church -- nothing nearly long enough to warrant changing and taking a kilt with me. If that be the case I'd rather walk or hire a taxi. If I had to change out of my kilt each time I had to go somewhere, it would no longer be a fun, comfortable garment to wear and I'd stop wearing kilts altogether.

So, having said that, I've never tried to ride a bike with my kilt -- a little too difficult to figure out -- nor with my motorcycle -- again, no idea how that would work. However I HAVE (and usually do) ride my scooters (like the Italian-style Vespa) kilted. Those are easy, but when you sit down you have to tuck your pleats under your butt and tuck them REALLY, really well or you'll be exposing yourself to the world when you go any faster than 20 km/h.. The whole Marylin 7-year itch yadda yadda effect...