We use Luminous Rip-Stop Nylon. It is best if the colours are bright. Divide the groups into as many teams as you have different colours of material. Send one team off with one Leader who has a number of the same colored strips, Say Red. The leader gives one strip to each team member who puts it in their trousers so that about 9 inches of it are showing out of the back of his trousers and tells the team that they are after Blue.
Red team have to run after blue, blue after green and green after red.
He is now also after blues. Once one team is used up, the team is removed from the chain - for example if there are no blues left, it is Reds after Greens and Greens after Reds etc. The game ends when there is only one team left, or to cut the game short, when one team has more than half of the group. It is important not to tell other teams who is after them although when there are only two or three team it is not hard to work this out. It is to be played at night in a slightly wooded area.