Using cloth training pants just makes sense! 

You want your child to feel when they are wet - encouraging faster potty learning. Cloth training pants are great for containing leaks and help to motivate your child in the process.
All the below training pants allow toddlers to easily pull their training pants up and down by themselves, just like big-kid underwear. And the absorbent layers and waterproof lining protect against the inevitable accidents that are part of the potty training process. Cloth training pants can also be used for bed wetting protection. And just like the 
reasons why to use cloth diapers, using cloth training pants is better for your pocketbook, better for the environment, and better for your child's health! 

Cloth Training Pants are Not diapers, they are for child who is ready to start the potty training. 
When to start the potty training? There's no magic age at which children are ready to start learning how to use the potty, but some develop the necessary physical and cognitive skills between 18 and 24 months of age. Many parents don't start potty training until their children are 2 1/2 to 3 years old, when daytime bladder control has become more reliable. And some children aren't interested in potty training until they're closer to 3, or even 4. (The size of out training pants ranges from 12 months to 4 years old).

Below are some of the signs of readiness for potty training:

  • Can follow simple instructions, such as "go get the toy."
  • Understands the value of putting things where they belong.
  • Has words for urine and stool.
  • Has "dry" periods of at least three or four hours, which shows that his bladder muscles are developed enough to hold urine.
  • Understands the physical signals that mean he has to go and can tell you before it happens or even hold it until he has time to get to the potty.
  • Is coordinated enough to walk, and even run, steadily.
  • Urinates a fair amount at one time.

* info obtained from babycenter.com

How many pair of training pants do you need? It depends, of course, on how often your child has accidents, and how often you want to do laundry. In the beginning you will probably be switching back and forth between diapers and training pants. Later when you are using training pants full time your child will likely have fewer accidents. So six seems to be a good number to get you through potty training. Of course you are welcome to start with just a few, maybe even one of each kind, to see which you like best.