Just to pick up on a slight mischeviousness in the thread title.
From the Article: That said, the lessons only pertain to daylight hours. Virtually all high-vis items have reflective patches or strips, which are, without doubt, a boon after dark.
A lot of my riding is done in dark or dusk/dawn visibility when vehicles will have some sort of light going, I have the choice of wearing reflectives or carrying them on my trips in broad daylight, I tend to still wear them rather than tote a little bag around unneccesarily. As stated before tho, I'm a fan of the Sam Browne belt as that is more uniquely cyclist, different enough to the usual slab of yellow to catch the eye a bit better and doesn't look like the ubiquitous builder on the pavement or delivery driver on a job
+1 to Fossyant.