Doesn't she look happy with her "new" stroller?
It's actually a stroller she got for her birthday (or Christmas?) a couple years ago, but the cover had torn. We tried duct tape, but it was met with disapproval and eventually torn off.
I was trying to figure out how to fix it (with minimal work!) so I went digging through our box of stuff to donate to Goodwill and found an old dress shirt of my husbands. I cut the back out (all the way along the side up to the neck, but not including the arms), then I turned it upside down. I took the double layered upper back and folded it over to make an edge to hold the bottom on. Then I hemmed up the sides to fit the width of the stroller. To make the "ties", I made long tubes of fabric, sewed up the sides, and turned them right side out (anyone else remember sewing your own "scrunchies" in the 90s?). Finally, I turned the top part down, and sewed the loops on the inside of the fold. I did not trim the length so it actually just falls behind the stroller. The bottom (of the shirt) was already hemmed, so why make more work, right? Because the shirt had a pleat in the back, I didn't have to do any pleating on the edges to make a "seat". The pleat makes a natural "seat" because it hugs around the baby doll like a hammock.
So here's the new stroller cover, complete with baby. Green Baby (yes, that's her name) seems to seem content. Wouldn't you say?