Doesn't stay in place

The color is perfect (it's not as blue-green as it looks in the photo), the fabric is soft, but the strap isn't nearly long enough to go around the back of the chair, and without the strap, it will never stay in place. I have extended the strap all the way, but it is still so tight that it yanks the two tabs and the hooks sideways so that the back of the cover is always twisted to one side or the other. I'm going to see if I can just buy a length of elastic and sew it in place permanently. The hooks are a pain. Also, there are no instructions as to what one is supposed to do with the three foam rolls that come with it .... are they supposed to be tucked inside between the seat cushion and the arms and back as a deterrent to the cover coming loose every time one sits down? Not sure that's really going to work. But hey, it's only $23. If it doesn't work, I can throw it away. Or return it. Whatever.

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