First outfit: the main character overall is really grounded and solid in her beliefs even though she gets shaken a little so starting off theres orange for her science (which is super brown and red) blue for io (because shes connected to it) green/brown for earth and white for death.
Second outfit: she like becomes closer to the teacher and agrees to go to io with the teacher so like the big blue jacket and (the purple/burgundy was for the teacher) more white bc shes closer to death. Theres not a lot of earth colors bc shes like shaken and stressed out lol.
Third outfit: she dies and joins the earth so only white and brown.
Shoes are green/brown because shes really solid and doesn't want to leave earth like that's where her heart is.