An amazing tutorial on how to make your very own Sailor Senshi/Fuku Cosplay! Had a hard time finding really descriptive youtube tutorials surprisingly. So had to find step by step images!
If you still need to visually see how to make a pleaded skirt here’s a youtube link to How To Cosplay: Make A Pleated Skirt! Though she doesn’t use actually cloth in the tutorial she uses paper - I think it’s pretty useful.