Be Safe, Be Seen When Cycling - But What About Dark Clothing?

The weather is really starting to turn colder now, so I've invested in a new winter jacket. Only one colour option available in the store (black!), which got me thinking about the topic of 'be safe, be seen' and whether dark clothing or black really is an appropriate colour to wear on a bike.
Do you steer clear of darker clothing when you're out cycling, or use extra reflective kit? What about lights, always on or just for poor light/night conditions? Let me know what you do to be safe and be seen!
Happy cycling, folks!