Originally Posted by
CliftonGK1
Reflective vest or sash, IIRC. There's plenty of randos here using a shoulder/waist sash, or a reflective harness like the AmphiPod (my favourite).
Either way you're right. The reflective gear is usually more eye-catching than tail lights.
I'm not sure about that last part, but while you can always see taillights (since they put out light, rather than just reflecting it) while reflective material is much more picky about whether you can see it (someone else has to shine a light on it).
I'm sure both is best. But if you had to choose one, I'd stick with the light for sure.