A very good point, Rahman, about highlighting her grace and femininity.
Also, it is a reference to very early Wonder Woman comics from World War II era since she wore a skirt back then also, I think...
And, if I am correct, she's wearing a similar skirt in the Rebirth Comics also. Though, I may have gotten her confused with Supergirl. At any rate, I think the skirt that Wonder Woman wears is a good costume decision.
What is the Goal of the life? It is to create yourself a Soul ~Alejandro Jodorowsky