There is no need to go out and buy special cycling gear – you can ride in your everyday clothes.
Riding in the cold: Wearing layers is the best way to control your body temperature. Gloves and ear warmers are particularly helpful when trying to stay warm.
Riding in the dark or rain: Wear bright clothing as you should make special efforts to see and be seen. Hi-Vis yellow and green are best colors for visibility — you will want to steer clear of dark colors.