Simulate clothing

Hi I want to create a character with 70s pants (really wide in the ankle)
Do I have to create two different objects (One of my character and the other of the 70s pants?)
How can I simulate “Clothing”. I need to use different clothes for my character.
Is there any tutorial that could explain me how to model this? Thanks

I had the same problem too…I found on 3d max web site how to make clothing …this tut gives you an idea you can use in blender. I am still learning my self too. but this tut really helped me. google 3d max site.