Dave Miller wrote:
Is it a generally agreed upon practice that regardless of your rank that you always wear a white belt when visiting another dojo?
I believe it may depend upon affiliation or just plain common courtesy. Typically, if you're a visiting a different discipline (Kung-Fu, etc.) and taking a lesson, then I have always seen wearing a white belt to be appropriate. If you are visiting an affiliate dojo, or a dojo of another discipline to put on a seminar or demonstration, then wearning your normal rank is appropriate.
I haven't tested in years; don't really plan to, so in "my" dojo, I wear my plain shodan, and in all other places, I wear the white belt to be on the safe side. The color simply has no bearing on performance, but it definitely helps hold up the hakama.