This iPad sleeve is 8x10.4 inches (20 x 26 cm) and fits all iPads.
For materials you can use:
DK, Light Worsted Cotton Time from Schachenmayr (red 030 and white 001);
4.00 mm hook;
1.7 cm Button;
Tapestry needle.
For the green sleeve you can use a green yarn and a self striping yarn (yarn which has 2 colors)