how to replace default garments (space suit) with CCs

Seeing you didn't get any answer, here I am. So, what you want is to make a default replacement, right? So is to edit a in-game item so it looks different, and not to add a new one. Have you ever done any kind of CC for this game? You should do it first if you didn't. You'll need to know how to create CAS items like clothes and accessories, just the basics. Then, the only difference between creating a standalone and a default replacement is that the last one is done by clicking here:



(The same works for objects) You said you work on MAC right? I don't know how different MAC's interface is, but I hope this helps enough. For anything you need, just feel free to ask, we're here to help (or try to do it at least)