We don't even know the validity of the rumour.
And even if we assume it's indeed coming:
SG Ezreal is most likely not even going to wear shirts, who says he's going to in the first place? Considering in Sailor Moon and Cardcaptor Sakura where much of the inspiration of the SG skin line has come from, the male characters wear suits in them.
Secondly, even if he is wearing skirts or being effeminate or whatever, what's the big deal? Do you have issues with girls wearing jeans, too? Why so diehard on the gender stereotype? Can't Ezreal be a guy who likes to wears skirts, or just don't mind wearing them, or just don't conform to the traditional view of his gender, or just don't identify as male in 1 of his skin because skins are not canon most of the time anyway, etc etc etc? Is 1 skin or 2, or 1 character or 2 in the entire game that goes against the traditional gender archetype, or merely just not heeding it 100%, that much to handle?
idk man.