For the iPad Sleeves I've made so far I've quilted the lining. In preparation for the pattern pieces coming VERY soon, here are some details:
Quilt Sandwich
For the lining pieces I've used
the standard "quilt sandwich" of fabric backed by batting, and
then a piece of muslin on the bottom. So cut 1 A & B from batting and 1 A & B from muslin.
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Batting (or Fleece)
For the two in medium weight quilting cotton (pictures of grey one are here) I've used Warm & Natural cotton batting. This is the cotton batting I use for most projects. It is a nice weight for quilts, provides some cushion to lightly pad accessories, it's easy to sew, and reasonably priced.
The one made from cotton/linen blend fabric, I used Quilters Dream Request. This is the lightest weight batting from Quilters Dream. Since the cotton/linen exterior fabric is about twice as heavy as quilting cotton, the lightweight batting worked nicely to keep the sleeve from becoming thick and poufy.
Quilters Dream is not as heavy or dense as Cotton Dream. It is perfect for lighter weight quilts to use in the warmer months. It gives quilts a really fantastic spongy feeling and they look more modern and sleek with the thin batting.
You can also use fusible fleece for the sleeves. The fleece I use is Pellon 987. It fuses well, and is soft and flexible.
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Trim the Batting A Pieces
I've trimmed away about 1" of the batting from each of the upper corners of A. This gets rid of some bulk where A & B attach to each other. It doesn't need to be perfect, just cut away enough to remove the batting from the allowances.
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Quilting
I've quilted the pieces about every 2" horizontally. The flap will fold more easily if the quilting lines are parallel to the fold. You can quilt it from left to right (vertically), but I think it works better to quilt horizontally.
The quilting lines can be closer together or further apart. Every 2-4 inches is probably a good guideline. For something like this, where the quilting is on the inside, I just eyeball it and then stitch. Any mistakes or wonky lines aren't going to be obvious on the inside.
Sew all the quilting lines in the same direction. It doesn't matter so much on something small like this, but it is a good habit to get into sewing all straight quilting lines in the same direction. If you sew one one way and then come back the other way, the differential feed will slight push the fabric in different directions. That can be really obvious on quilts, so I try to just make it a habit to always sew the quilting lines in the same direction.