Some of this information was found in an Ar Tonelico II walkthrough
Credit goes to as needed: Eleinia
Costume Obtained: Already Obtained at Beginning
She wears this clothes since the start and in her Cosmosphere Level 1. Her shoulder length-hair is stuck up using a red ornament. She wears a moon-shaped circlet on her hair. Her outfit is mostly light magenta. She wears a pair of high-heeled shoes with ribbons.
Costume Obtained in Cosmosphere Level 2
She wear this in Cosmosphere Level 2 but she appeared late since Luca Level 1 has entered Level 2 and locked her away. She tie her hair in a pigtail using a white ribbon. Her clothing is very simple ( Luca mentioned that she preferred it that way ). She wears a long-sleeves shirt, a red bow, a black vest, a black tight pants and a pair of white short-heel shoes.
Costume Obtained in Cosmosphere Level 3
Costume Obtained in Cosmosphere Level 4 Her hair is tied into two short ponytails using a golden ring and her hair is embroidered with a golden circlet. She wears a sleeveless pink-magenta shirt, pleated pink mini skirt, a sun-shape brooch along with two long magenta ribbons are clipped at her chest, a pair of long white gloves, a pair of magenta stockings and a pair of white no-heel shoes.
Costume Obtained in Cosmosphere Level 5
Costume Obtained in Cosmosphere Level 6
Costume Obtained in Cosmosphere Level 7
Costume Obtained in Cosmosphere Level 8
Costume Obtained in Cosmosphere Level 9
Tres Super Bien
Costume Obtained in Frelia's Level 3 Cosmosphere