I notice that there are white and blue keikogi and hakama. Are there any rules on wearing one or the other?
There currently is no restriction of wearing white or blue keikogi/hakama sets. However, traditionally white is worn by female Kendoka and also by the Imperial Police Department of Japan. However, most people (male and female) prefer blue because it is easier to take care of and does not get stained or dirty as easily. Also, since 90% of the other Kendoka wear blue, a person wearing white stands out tremendously which can be good and bad. At Gulf Coast Kendo children under 18 years of age are required to wear Musashi Stitched Gi-tops.