2. If one holds a 2nd dan in one style but 1st dan level in 2 other styles, are they a 2nd degree black belt or a 4th? Is it appropriate to wear a belt with 4 stripes on one side and 2 stripes on the other with that style on the belt? - Vicki

... Different degrees obtained in different arts do not add up to a higher dan grade. Although there is no question that further levels of training expands the knowledge and experience of the martial artist, it doesn't necessarily mean that within the curriculum of any one style that they have progressed.
... The black belt holder knows better than others the origins, teachers, and examiners that granted their degree status. It is a redundancy and a great expression of self-indulgence to try to show others more stripes in the belt than the ones really deserved. Perhaps, your question reflects an observation of someone that it is doing it, or simply a genuine doubt, however it should be made clear that in the study of the martial arts, no matter what traditions they come from, the dan system is not contemplated as a reward, nor as an accumulation or expression of status and self-importance.
... The appropriate way to deal with the question is to wear the belt degree from each discipline within the respective class environment or activity. If there is more than one art in question then simply change your belt when the occasion requires it. A more practical way is to wear a black belt without stripes at all so it can be worn in all of the practiced arts. That's what we do.