The Man and I both have fleece-lined denim jeans and rave about them. The concept is actually very simple. You're going to sew two identical pants without finishing the waist or cuffs then insert one inside the other. After the fleece is inserted into the denim, make a casing for the elastic waist and finish the cuffs. More detailed instructions and pictures below.
TIPS: - Using a light-weight fleece (or flannel) will make the garment less bulky and therefore easier to get under the foot of your sewing machine. Fleece also stretches a little whereas flannel doesn't, so with flannel you have to cut and sew your two pairs of pants exactly the same size. - When cutting your pattern, allow an extra inch at the cuffs so you have more options for finishing the cuff opening.
ASSEMBLE THE PANTS:
1. Use your favorite pattern to make two identical pairs of pants up to the point where the everything is finished but the cuffs and waistband. 2. Turn the denim pair right side out. Leaving the fleece pair inside out, insert the fleece into the denim. If you look inside, you'll see your nicely sewn fleece pair (in other words, the sewn seams of both pants are now facing each other on the inside). 3. First the waist: Match up the seams and tack them into place with a few stitches so that they don't shift while you are finishing the waistband. 4. Now that you have tacked the waist into place, finish the raw top edge of the waistband by either serging or zigzagging and fold over to make a casing for the elastic. Insert elastic. Waistband done! 5. All that is left is finishing the cuffs. Figure out your desired length. Turn the outer (denim) cuffs under and turn the inner (fleece) cuffs inward. This means all the seams are hidden. My fleece peeks out just slightly from the denim. Sew closed. Roll them up or wear them down.
An extra pair with a ruffled cuff.I made this pair to wear underneath cotton skirts for the winter. Hope the tutorial is clear. Happy trouser-making!