Measure the width of one of your pillow inners and times that number by 4 to give you the total length you will need for your pillow mat.
The pillow inners I used were 45cm wide. 45cm x 4 = 180cm.
Measure the length of one of your pillow inners. The length on the one I used was 70cm.
Taking into consideration seam allowances, take your measurements and cut as below or adapt for your own sized pillows:
BACK - 1 piece of fabric 182cm, (180cm plus 2cm for the seams) x 75cm (70cm plus 5cm for seams)
FRONT – 1 piece of fabric 182cm, (180cm plus 2cm for the seams) x 90cm (this part needs to be longer as it is folded – as you will see below.)
Take your front fabric piece and turn over one of the long edges by 1cm, and again so that the raw edge is enclosed. Press if desired, pin into place and with a simple running straight stitch in place.