Again, because of differences in the anime and manga, there's even differences in... the clothing.

Manga
Hotaru's color scheme mostly consists of different tones of green. The designs that appear on her outfit are mostly triangles. She's got blonde hair, light blue eyes, and she is sort of pale. Her dress and cloak-esque thing are a very light green, but her sleeves, hat and collar are a dark green. The triangles that appear on her outfit are all yellow, and the jewels on her hat and collar and a light blue. She also wears diamond shaped earrings that are a light blue as well. There is also a string or belt-like item that hangs around her waist that has light blue diamonds going accross it. Underneath her dress, she wears a pair of long, baggy pants.
Hotaru is never seen carrying a staff/wand (the Wavemaster class' weapon).


Anime
Why the animators decided to change her outfit from green to pink and white, I don't know, and I personally think she looks better in green... Anyway, moving on.
As you can see, really the only changes are in color. Her hat, boots, and shirt (which are linned with blue now) are pink. Her cloak and dress (now linned with pink) are now white. The triangles went from yellow to blue, and now the jewels on her outfit are green.
Hotaru still does not carry around a weapon. In battle, she mostly uses Scrolls to heal and fight.


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