Headlight modulators are an excellent safety feature. I cannot name the number of times I have approached an intersection and seen a driver about to pull out into my path and then stop and do a double-take at my flashing headlight.
Wearing hi-vis clothing is another safety feature. Highway workers wear hi-vis vests so drivers can see them, would be a big help on motorcycles too.
But I don’t think I’ve EVER seen a motorcycle rider wearing hi-vis anything.