Using the lid of the mason jar, draw a circle onto the fabric about 1 inch wider than the jar lid. Cut out the circle.
Place the lid bottom side up placed directly on top of the middle of the fabric, bottom side up. Place a line of hot glue along the red outer rim and start to fold the fabric on top, bunching as you go.
Continue in the same manner until only 1/4 of the lid is left as shown above.
Stuff batting inside the top of the lid until it's poofy and even
Now seal up the last section of the fabric to the lid
Make a line of glue along the inside of the outer lid piece
Press the pin cushion lid inside the outer lid piece and let dry
Now fill the inside of the jar with sewing essential: pins, string, embroidery thread, zipper, mini scissors, etc and screw the lid on top (it will be harder to screw on with the fabric but should still work).