There are so many options in cloth diapering alone to make an expecting parent's head explode.
Basically, PUL and FOE are your friends if you're making your own. PUL is another topic for another day, but FOE is fold over elastic. Very useful for the stretchy curves that certain styles cloth diapers require.
Thankfully there are a lot of resources, including a giveaway that ends today. Fifty bucks to FOE Your Diaper Go to Sew Can do for details.