Jeans are ok for easy strolls in the park but for hiking tracksuit bottoms are better cos they're more comfy than jeans in all weathers especially the rain!
No never jeans if they get wet they will slow you down and feel horrible. They also arn't very flexible.! Joggers are better as they don't take long to dry and are more appropiate for the terrain
Get yourself a pair of combats, jeans hold more water when they get wet so do tick cotton tracksuit bottoms & light ones wont keep you warm if it gets cold.