My daughter had a baby and her friends told her I would make her a nursing cover. Isn't it interesting how every one assumes I know how.
I searched the Internet and found a tutorial here: http://sewmuchado.blogspot.com/2009/02/description-stylish-and-practical.html
I can never really follow a pattern. Click on the picture and you can see how I did the strap. I made it like I do my bag straps. It is more to my liking, with lots of sewing lines.
She has been using it. That is what counts.