writer is too busy wanking over Boruto that Ikemoto can only develop Sarada in terms of character design..
that is why she is wearing mature clothes compared to her age. Since that is the only development that can happen.
to put this in perspective:
let's have a timeskip about 10 or 20 years into the future. Only Boruto would've matured 10-20 years. The rest are still a bunch of 12 year olds wearing adult clothing. No new abilities, no new anything. Just 12 year olds with stilettos and neckties.
What they said.Just as Mitsuki, she doesn't get much development. Pretty much 90% of her development is concentrated in Gaiden still.
Ikemoto be like "why give her proper character development when instead we can make her clothes shorter and give all the development to Boruto?" :sdo: