Here is my free PDF pattern for a one-size fits most fleece/wool wrap cover for diapers. I hope you enjoy it! This cover is very trim and probably won't fit over bulky fitted diapers, but it works great over RRPs (seen below) and pinned/trifolded prefolds. For more specific directions than you see below, click on the RRP pattern link. I have detailed instructions in that PDF on how to sew the RRP diaper, and you can use those directions on this cover pattern and just eliminate the back pocket opening and add waist elastic and aplix. You can also make this into a AIO pocket (basically a RRP with velcro and a water resistant cover built in).
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THIS PATTERN DOES NOT HAVE A SEAM ALLOWANCE ADDED! DRAW AROUND THE PATTERN WITH YOUR FABRIC PEN, THEN WHEN YOU CUT THE FABRIC OUT LEAVE THE AMOUNT OF SEAM ALLOWANCE YOU LIKE TO SEW WITH (1/4 - 1/2 INCH OR WHATEVER YOU LIKE, IT DOES NOT HAVE TO BE EXACT AND JUST WING IT!). THEN SEW ON THE LINE. IT IS THAT EASY.
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You can also use this pattern to make AIO (all-in-one, means a diaper with a cover built in) or AIO pocket diapers with aplix if you want. You can sew an opening in the back and stuff it with an insert if you use microfleece, suedecloth or cotton as the inner or lay-in a trifolded infant PF. You can use PUL as the outer, or even fleece wings and a PUL body. As is, this pattern will not fit tiny babies and you will have to extend the wings or aplix tabs for super big kids. I would suggest using only stretchy fabrics, but if you don't than make sure you extend the back wings.
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You can also use this pattern to make AIO (all-in-one, means a diaper with a cover built in) or AIO pocket diapers with aplix if you want. You can sew an opening in the back and stuff it with an insert if you use microfleece, suedecloth or cotton as the inner or lay-in a trifolded infant PF. You can use PUL as the outer, or even fleece wings and a PUL body. As is, this pattern will not fit tiny babies and you will have to extend the wings or aplix tabs for super big kids. I would suggest using only stretchy fabrics, but if you don't than make sure you extend the back wings.
I make these front-closing Aplix. Just sew an approx. 6 inch strip of loop on the front about 1/2 inch down after sewing the cover together. Cut off the sharp edges so they can't rub baby! I also use special Granny-Jamma aplix tabs (named in honor of their creator on Diaper Sewing Divas ). To make these tabs you cut 2 pieces of loop and 2 pieces of hook the same size for your tabs (1.5 - 2 inches long or so, and curved like the pics above). Then sew one piece of loop to one piece of hook, catching cotton/poly piping between the layers. Sew on the loop side and zigzag down the piping. This leaves a soft edge that resists pilling. Sew your tabs on the diaper before turning, between the layers, with the loop sides facing the outer fabric. These make great cross-over tabs. It is important to use extended aplix tabs on this cover if you want it to fit.
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You can use any fleece to make these covers. I love minkee on the outside and microfleece on the inner, but you can use any fleece you find at Joann's, Hobby Lobby, Walmart, etc. These are two layer covers so you might want to combine thicker fleece with thinner to make the cover more trim. You can also use 2 layers of microfleece.
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I like doing these with seam allowance elastic added before turning and then topstitching everything but where the leg elastic is sewn. You can also make casings or do blind or faux blind elastic. Make sure to sew these covers with poly thread! When I sew my elastic in the seam allowance I sew it on the outer fabric side (when inside out, before turning) on the legs, and on the inner fabric side for the waist. I prefer the legs to roll in slightly to contain poop, and for the back to sit against the back. If you sew the back elastic to the outer fabric side then sometimes it tries to roll in and that can be uncomfortable. The yellow cover pictured above has seam allowance elastic, and the blue one has blind elastic and thus ruffles. Both methods work great, with the seam allowance elastic making the cover a bit more trim. I usually use Stretchrite knit elastic in 1/4 - 3/8 inch sizes. These can also be made with Lastin.