As for Shanks cosplay, both male and female cosplayers are interested in it. The long black cape, wite shirt and the slightly loose trousers, plus the sword and sandals, would make anyone manful and noticeable.
As the the captain of the Red Hair Pirates and one of the Yonko, One Piece Shanks is a laid back man, and different from many other pirates, he is not cruel but very friendly and easygoing. If you have beard and is high in stature, cosplay One Piece Shanks would be fun.