Pink with white trimmings, size >6 months; make a pair of rockabilly boots

I’m going to have to twerk around with this pattern to make it a bit bigger, maybe around 6-9 months, and also because my yarn is a lot thinner.
With white, started with 75 chains and worked dc on each ch. This white collar piece is now measuring 41cm long.
I am not going to join in the round straight away. Will leave a small opening at the back that can then be closed with a cute button.
Fasten off white and attach pink. Work rd1 of pattern. Finish with sc instead of ss (12 shells). Turn and continue to rd2. Work one last shell on beginning sc instead of ss. Repeat this row 3 more times, making sure the last row is worked on the RS. Join in the round with a ss on top of beg ch3.
Rejoin white and proceed to Rd3 of pattern. On the last shell of this rd, carry pink yarn through. Fasten off white. Proceed to rd4 of pattern with pink.
Armholes: ch11, skip 2 further shells and 2sc spaces for armholes (armhole is composed of 1 half shell, 4x ch2 spaces, 3 shells, 1 half shell and 11 sc on the bottom). 4 shells made on front of dress. Repeat armhole.
Continue to Rd5. On ch11 space, sk2, sc-ch2-sc, sk2, shell, sk2, sc-ch2-sc, sk2, shell in next ch2 space.