What You'll need:
PUL (polyurethane laminate cloth) in a diaper sized piece
Fleece in a diaper sized piece
2 5" 1/4" wide pieces of elastic
1 5 1/2" 1/4" wide piece of elastic
1 small safety pin
Lay out your Pattern on your inner material and cut around it, leaving 1/4" for seam allowance. Also note: I'm saving time by cutting out two pieces of fleece at the same time. On a mat, with a rolling cutter.
Fuzzi Bunz(tm) have a rectangle of PUL to hold the elastic in the back at the waist. Lay your Pattern on top of the PUL. Mark where the rectangle ends, and how far up you need to cut (about 1/2") and then cut out the PUL. Making sure to leave that extra rectangle at the back/waist of the diaper. I marked mine with pins, and then just remembered that I needed to cut 1/2 up.
If you've got something you'd like to appliqué or embroider on the back of the PUL now is the time to do it. Simply locate the middle of the 'butt' area and proceed. However. I wouldn't appliqué or embroider anything on already used PUL. The brand new PUL, you can wash, then dry in very hot and it will seal the holes created by sewing so it doesn't wick.
See here that in addition to the extra 1/2" rectangle of fabric on the back of the PUL. I've also made about a 1/2" cut parallel to the top of the rectangle. This makes it easier to sew, easier to serge and just kind of easier all around.
Set the sewing machine to it's biggest zig-zag stitch
And on the next to widest stitch.
Pin the elastic down with the needle and go forward and back up to lock the thread down a couple of times. Then pull the elastic towards you as you SLOWLY zig-zag down the elastic. I say SLOW because you are trying to not SEW ON THE ELASTIC. You want to just miss the sides of the elastic. This creates a thread case that makes the elastic much more even, more elastic-y (because it's all even, it's not more stretchy in one spot than another) and it lasts longer because it doesn't have much in the way of holes punched all over it.