In reality it makes little difference what colour your riding garment is, it's reflectivity and illumination that makes you visible to other road users.
But the dark clothing comment referred to peds not cyclists. Are you saying a white jacket isn't anymore visible at night than a black jacket?
From the linked BBC piece
but it was actually pedestrians who suffered the biggest rise in deaths last year, up 12% to 453.
More were seriously hurt too, up from 5,200 in 2010 to 5,454 last year.
"Pedestrian failed to look properly" was a factor in 59% of those accidents, and is easily the biggest single reason why pedestrians got hurt.
Parked vehicles blocking the view helped cause 16% of those injuries, and for 824 people who got hurt (about 4% of the total), "wearing dark clothes at night" played a part.