@LucasPratt  
Best analysis I’ve seen so far to explain it.

@Chinigan O’ Donovan
 
Adagio wears a sultry outfit that accentuates her features and would probably show cleavage in real life (but they didn’t put detail in that area, as this is a kids show). Aria wears a denim-looking green jacket with the ends ripped off, which is basically screaming “rebellious” and “edgy”. Sonata, the adorable clumsy one, wears a skirt and pink-tie up shoes that she usually stands on the tips of her toes with.

@DoomPony  
Good point- I hadn’t viewed it from that angle.

@Chinigan O’ Donovan  
The power structure appears to be based on hair volume. Sonata’s single ponytail is at the bottom and Adagio’s curly mass on top. Therefore, they will be forced to surrender to the Rainbooms’ magically lengthened hair.

@Background Pony #29FD  
Well okay, that’s true. But picture this:
 
-Adagio appears the most confident and leader-like, shown by the tightness and oddity of her sleek, “slithering” figure and character.  
-Aria wears purple jeans which are a tad more modest, but also has the ripped jacket to give her a more “tough” and aggressive look.  
-Sonata is more skimpily dressed, and somehow her appearance already makes her seem to be the lowest rung of the group. It’s harder to explain hers, but there’s something.

@Chinigan O’ Donovan  
They’re all hot, so they all dress hot. ;3

Could someone make a connection to how their outfits correlate to their personalities and attitudes?

Aria is not amused.

I love all of them. :3