It confirms that it was indeed gear designed for male characters, and is therefore not "crossdressing." Unless you mean to say that the devs intended from the start that males be able to crossdress, thus invalidating any and all arguments insisting the contrary.
Sailor uniforms are a thing, worn by sailors. Especially male sailors.
You talk like everything you know about Japan from anime is 100% the whole unabridged truth, while simultaneously proving you've never seen Card Captor Sakura. Boys have sailor uniforms, too, they just grow out of them faster.
The change to the sailor shirt was made before release based on demand from players with female avatars. This thread, if you'll note the creation date, was likewise made before official release in the hopes of eliciting the same sort of response. It failed, but is kept alive and in eternal tormented stasis like so many Meracydians. Clearly we need to summon a primal.
