Using Fleece for covers or AIO’s is great! You have to make sure you use a good fleece like Malden Mills. If your making a 2 layer cover use 200wt fleece. If you making a 1 layer cover, use 300wt or Windpro fleece. Store bought fleece is thin and not dense. It looses it pile very quickly and will wick. MM fleece is densely woven and keeps a nice pile and does not pill. It will last for a long time.  The cover here was made before I knew about MM fleece. It’s a 2 layer store bought fleece.

This is the template I used to cut out my fabric. I just winged it with the
measurements on this one.
template.jpg (8620 bytes)
On this cover I cut out 2 pieces because this fleece is pretty thin.  Usually
fleece will stretch one way. You have to decide for yourself which way you
want your cover to stretch. This one stretches from side to side and it’s
pretty darn stretchy.
fleececutout.jpg (15803 bytes)
On one piece of the fleece, sew in the elastic. I sewed in the elastic on
both legs and on the back.  This is my first fleece cover and I’m not sure
this  size elastic is good.  Because the fabric is thick,  you may need a
wider elastic Near the end I decided I didn’t like the way the elastic was
gathering on the fleece when it was sewn in. I ended up picking it out.
Tack one side of the elastic down, pull it tight and tack it down on the
other side. After you turn it right side out you will top stitch next to the
elastic to make a casing.  To make a single layer fleece cover, sew the
elastic closer to the edge and after it’s tacked down, fold the edge in and
topstitch. There is no need to stitch the raw edges of fleece.
elastic-fleece.jpg (15100 bytes)
Finished with the elasic. Of course this is the elastic sewn in. It wont look
quite like this if you just tack it at the ends.
elastic1fleece.jpg (17171 bytes)
Next, take the other piece of fleece and put them right sides touching. I
know fleece doesn’t really have a wrong and a right side, but the side
with the elastic is the wrong side. Stitch the two pieces together all the
way around leaving an opening so you can turn it.  Be careful not to sew
in your elastic if you didn’t sew it all the way in
edgefleece.jpg (13669 bytes)
Here’s the opening after I have turned the cover right side out.  Next
topstitch 1/4 inch from the edge all the way around except elastic areas.
On the elastic area’s topstitch on the other side of the elastic (body side,
not edge side) as close or as far away as you want. I prefer do get as
close to the elastic as I can without catching it in.
turning.jpg (11390 bytes)
I then added a few matching snaps and had myself a fleece cover.
Velcro/Aplix will also work great on this cover.  The wings ended up
being a bit long on this cover so I added a couple socket snaps to the left
wing so the right wing could overlap to get a tighter fit.
fleececover.jpg (16765 bytes)