In the plant world, is it survival of the fittest, of survival of those whose life/death best serves the purposes of other organisms? Think of nightshades versus apples. Nightshades may be excellent at fending off predators, but there's a whole lot of apples, and variants of apples, in the world.
In the human world, how can evolution explain why we put designs on our gloves? Does it enhance our survival? Gloves are just as warm when they don't have a design. Does it increase our chance of mating? The girl who owns them is already married. Is it just possible that we put designs on gloves because we like designs on gloves? Because we like beauty?