Step 7: Measure and cut the tummy-bag
I use polyester “liquid” satin lining fabric for the tummy-bag. Any non-stretch fabric should work. I find that stretch fabrics are prone to snagging in the zip. I think it’s important that once the monster has eaten a child’s worry, it stays down. If the body of your monster is nearer the minimum 12” than the maximum 17” I suggest avoiding slippery fabric for the tummy – go for something with a bit of grip, instead.
We’re basically making a small bag by sewing up the sides of a long strip of fabric, folded right-side to right-side. The right-side of the fabric will end up on the inside of the bag, with a flap turned outwards at each top edge to create a hem.
Cut a single, narrow piece of fabric – about 8” wide for the 8.5” wide monster body – and fold it in half so that the fold forms the bottom of the tummy pouch.
We’re taking our length measurement from our actual monster – from the top of the lips to near the bottom of the body, plus 2 inches extra for turning the hems at the top.
The measurements don’t need to be exact. Think about where your tummy bag will sit when we layer up the monster’s body pieces to sew them together. It’s fine if the bag’s edges get fixed into the main seam, but if you want to avoid that, shape the bag to fit the contours of your monster.
Because the tummy-bag is also the lining for the mouth, we need the back of the bag to be slightly longer than the front. The longer back edge attaches to the back of the top lip; the shorter front edge to the back of the bottom lip.
In a sewn monster made of tightly-woven fabric there’s no need to make the raw edges of the bag’s outside look nice – the seams just need to be strong. Overlock, zig-zag stitch, or French Seam the raw edges if you want to tame the fraying.