Cardboard (2 pieces 42cm x 50cm for my dining chair)
Approx. 1 yard Fabric (I used Michael Miller Zoology in Lagoon)
Heat’n’Bond Iron on Vinyl (Edit: see follow up post here for comments about this)
240cm Bias tape or ribbon
1. Measure chair back and seat. I wanted the back to sit just below the top of the posts, so the back measured 42cm (16.5”) wide and 50cm (20” tall). The seat was 42cm (16.5”) square (or close enough to square.
2. Cut two pieces of cardboard 50cm x 42cm, and glue together. I was worried a single piece of cardboard would bend/fold when Little Man put the chair to the test and thought it would be stronger with 2 pieces.
(Side note: Box from my Baby Jogger City Select pram – LOVE my new pram!)
3. So here are the fabric pieces I cut:
Note: I actually had 41cm square cushion inserts for another project that I haven’t got around to making, and I wanted the booster cushion to be slightly over-stuffed, so I went with 40cm square for the cushions. 2cm seam allowance is actually 1cm on each edge of the pieces.
4. Conveniently, the Heat’n’Bond Vinyl I had was 42cm (17”) wide. So I cut a 42cm square for the top of the cushion, 2 x 26cm wide by 42cm high rectangles for the back of the cushion, and a 42cm wide by 52cm high piece for the back of the chair. (I decided t0 skimp and not put vinyl on the back of the chair back.)
5. Iron vinyl onto the right side of the fabric pieces, following the instructions on the pack. I applied the vinyl to the centre of the fabric for the chair back so that the seam would run down the middle of the back of the chair back (I hope that makes sense!).
7. With right sides (vinyl-covered( together, pin and sew the two long edges of the cushion cover together.
11. For the chair back, with right sides together, sew the long side of the chair back fabric together.
14. Turn the chair back right-way out and press (remembering to use the pressing paper on the vinyl!).
15. Cut a piece of quilt batting 55cm x 90cm. Fold in half and tape (or glue) to the glued-together cardboard (to add a bit of padding to the chair back). I used stick-tape as I want to re-use the batting when he out-grows the booster!
16. Slide cardboard piece into back cover and tie to back of the dining chair. Place cushion insert into cushion cover and tie to chair.
16. Place small child on top of chair and a plate of food in front of the child. Stand back and admire your work (it’s up to you whether you admire the small child, the food or the chair back and booster cushion).
P.S. Apologies for the lack of photos of the steps, I wasn't sure how it was going to work, and just wanted to the project done! I tried my best with some sketches! Let me know in the comments if it doesn't make sense.
Edited to add: P.P.S See my follow up post here for changes that I'd make if I were to make this again!