The hi-vis clothing (like vests) is a small step away from the simple commute. Such clothing is generally not essential, but everyone's needs/traffic situation is different, so it may be the perfect thing, even for simple commuters. Permanently wrapping your bike with reflective tape (or something similar) perhaps better fits the simple way if you really have a significant high visibility need. You do it once, and then your bike is all ready all the time, and you can wear your normal clothes. (Not the same as a vest I know). Even a flag or something always on the bike would be better than a specialized clothing article.