The pattern i linked in the above post comes with sewing instructions.
It's hard to find free online tutorial as the pattern are dated.
I did link one on how to make a proper puff sleeve tutorial from and existing straight sleeve pattern. It the one i used to make my Mami puff (wish I kept my drafted pattern now. lol)
The last episode aired last night with a "Humanity is still in Decline." send off. There a good chance a second season will pop up in two years time once the LN produce a few more stories.