I don't mind the changes, honestly. I played it in Japanese when it first came out, and those two costumes in particular annoyed me, especially the vampire costume. You can't tell since it's only showing you the female costumes, but the male vampire costume looks like a 19th century gentleman, whereas the female character's is...buckled straps and bunny ears. That was the only case where the gender differences in the costumes was a little too over the top and the only one in the game that made me go, "OH, COME ON!" at it - with all the others, the costumes were mostly the same, but that one was a bit much, so I can see why they decided to change it for the western release.
I also don't mind the aging up, since it seemed a little ridiculous to have a character like Edea be that accomplished at 15. Making her older actually makes more sense to me.