So the costume is expected to fit correctly on this character model. But that does not necessarily prevent him to fit on other (male or female).
Then you have to try and maybe make some adjustments, I can't tell you like that.
You can eventualy use some pluggins to convert to your model...
Gotcha that was kind of what I was thinking. I have been working mostly with genesis 8 models and have had to tweak some of the fits there, but Aiko 3 was new to me. Thank you for the info!