Big deal. It's just some legs. Ikemoto's version, Kishi's version, either way it doesn't make a difference to me. I've just never really found legs alone to be so sexual without anything else being exposed (underwear, cleavage, genitals, etc...). That is why Sarada's design doesn't strike me as so bad (regardless of the version).
Now sure I wouldn't necessarily let my 13 year old daughter dress like that if I had one. However, for a fictional girl, it's fine.