Thank you for your lovely comments on my new bag. It is loosely based on the design from the following website. The end result of the finished bag for me was 15" x 12" x 4" and I did not put on the side pockets nor the magnetic snaps.
http://amingledyarn.wordpress.com/ga...ma-diaper-bag/
As for the fabric I have checked and cannot find who manufactured it. I am going back to shop at the end of the week and I will check if I can find out more info. It is curtain fabric - I bought it because of the fabric weight.