RE: How to sew your own floppy seat cover
I think it is a great idea. They would be easy to make. And I bet a lot of people don't believe you. The only suggestion I have is in response to the seatbelt thing. I didn't use the floppy style seat cover but the one I used had it's own belt. The problem was that if you wanted to actually "fasten" the child to the cart you had to rethread it everytime you used it. So I cut the seat belt in back and attached a second clip so I could clip the belt around the seat to secure it and then clip it in front around the child. So I would recommend if someone wanted to use their own belt to do something similar. Maybe even using two small caribineers in place of the clip in back.
Anyhow, I really do think it is a great idea. I just wanted to share my solution to my personal vent in case it helps.
Veronica
Miss Ellie 11/03
Baby Audrey 4/08