My sister gave me a car seat to use for our new baby, only problem it was VERY pink, so I decided to recover it!
First I ripped out the seams holing the different parts of the car seat together, the nice thing was the fabric and batting was surged together for each section making it easy to take apart.
Here is how the darts looked when the stitching is ripped out
next I pinned each piece of the car seat to the new fabric with the batting side up
You can surge the new fabric onto the old, but I just did a zigzag stitch along the original surging line.
The slots where the straps come through are pretty much big button holes, my machine couldn't make one big enough so instead I did a zigzag stitch catching the original car seat fabric and used a seam ripper to open the slot.
Sewed each section together top first, then bottom, then together in the middle.
Finish off with some bias tape, add a cute baby....
And pink becomes cute green!