This is not a Watchtower picture, but I certainly saw lots of West African Bros at Twickenham in the old days, dressed exactly like this. It certainly added colour to the proceedings.
When we went to one of those Eastern European Conventions in the nineties there were Japanese posing for photos in kimonos..
Perhaps your experience had more to do with it being St David's day??
Iechyd da....(that is not a mistake, it is a Welsh greeting!) I Think ......