My next project is going to be making a cover for the car seat that will be able to block the cold weather and light is little one is napping.
ANSWERS TO QUESTIONS:
Ok- Sorry this has taken a bit to get answered (things got crazy around the house). Yes I was able to measure both the double stroller and car seat for the amount of fabric I would need.
With the Baby Carrier:I was able to remove the cover and measured (I already alloted washing and folding under for a seam into these measurements)
the top part (where the babies back is) at 27 x 25
the bottom part (for babies butt) at 20 x22
the shield for over head (to sew onto the shield already there) 28 x8
baby head cushion 7 1/2 x 25
Now position the fabric over the center of the top part of carrier (mark where the straps need to come through the fabric). I used a button hole stitch on my sewing machine and with mine even maxed to the biggest button- I had to do 2 to make it wide enough for the straps and then cut in the center. You do this for any of the straps that need to come through the fabric.
Pinning the fabric to the center of the top piece is the simple part, it's the sides and corners where you have to do a lot of folds along the corners. I sewed my fabric to the existing cushion to have a good guideline and some cushion already there.
For the Shield I was able to remove the shield from the car seat and fold the fabric around the front and then sewed that on and then for the top part I again folded the fabric and sewed it on top of the shield fabric I wanted to replace.
Double Stroller measurements:
Front Seat 17 x 15 and 12 1/2 x26
Back Seat 35 1/2 x 14 1/2
Shade 1 (for back seat) 46 1/2 x 5 1/2
Shade 1 little line 13 x 1 1/2 and 13 x 1 1/2 (there are 2 here because of the split in the shade for the plastic compartment attached to the stroller)
Shade 2 (for front seat) 51 x6
Shade 2 little line 51 x 6
With both seats I was able to remove some screws to get the fabric off the metal frame but the inner frame of the seats I did not remove.
The back seat was a breeze to go ahead and make slits for the buckles and lay the seat flat to sew the fabric. The front seat was a different story and pain in the but because of the inner frame. Piecing the front seat was a bit more difficult but not impossible.
Just have plenty of patience, time, and pins to pin and repin fabric to where you want it. I hope this helped answer any questions