REALLY cute fun pattern. Though 2 comments for anyone else who is going to make one. On round 7 of the seat, there should be a comma on the 5th line down.

2 x sc - COMMA here - inc, 2 x sc
The way it reads it looks like 2 X SC INC but it’s 2 x SC, THEN increase. :)
LOVE the pattern.
Also, if you’re using plastic, it may help to poke a hole in the center of it before putting it into the chair. I was able to do it but I would have been very frustrated if I couldn’t get it through after already closing up the seat. :)