Fabric A (26cm x 18cm) x 2 pieces
Fabric B (16cm x 18cm ) 2 pieces
Fabric C (5cm x 18cm) x 2 pieces
Interfacing(26cm x 18cm) x 1 piece
Ribbon 27cm x 2 pieces
Iron the interfacing to one of the wrong side Fabric A
0 Fabric that you want to be on the inside
Folded Fabric B in Half lengthwise and pressed
Attached and sew Fabric C on Fabric B
Line up the bottom edges of the folded pieces (fabric B) and the piece of inerfacing (Fabric A) and Pin together.
Do for both side right and left.
Mark the center of each side and sew
Attached ribbon on each side
sew around edges with 1cm seam , leave about 2 - 2.5" inches across bottom for turning
Trim corners, Turn and top stitch
Decorate with button
Wala !!! Finally
Good luck .