This may be a silly question, but I have never used one before. I have been using cloth diapers for years, but I have only used fuzzi bunz or pre-folds with covers. I recently found really nice wool longies at a consingment store. Do I put them on right over a pre-fold? Or do I use a regular cover and use them as pants? I am confused because if I use them as the cover, then I have to change his pants every time I change his diaper? Any advice? Also I would like to get some more wool covers any favorites (long or short)?