I am actually suprised to hear he was wearing a v-neck. My experience is a lot of the older generation wear the cross over style as that is what they grew up in the arts wearing and seeing. I guess being "traditional" just depends on how far back you want to go. This is not at all meant to sound disrespectful, just an observation from another traditionalist.
I have also always understood that the v-necks were only designed so that Korean arts would look different than Japanese arts. Any ever hear anything different (or the same)?
Actually, I have pictures of him from the 70's wearing the white V-neck, before he was even 7th Dan. There is a photo of him from his team days in the 60's wearing the wraparound, but I suspect he changed as soon as the V-neck was available.