I am planning on using a mixture of MCN's and Flats for bub #2.

What is the best type of flat nappy to fold with?

Terry?
Flannel?
Fleece?
Muslin?

If i place a bamboo booster inside and a PUL on the outside will that be ok?

And is it best to buy them made up a squares or cheaper to buy bulk materal and cut up?