Everything said in subject. I need help with that thing cus I dunno how to do it (no experience in starbound codding) I know that this thing can be very simple but, huh. Thanks.
An even simpler way is to add the "nude" status effect to the armor. This will cause ALL armor that is equipped (even ones without the status effect on them) to not show. This is the effect that is used for certain kinds of beds. Add the following to your armor's .json file: Code: "statusEffects" : [ "nude"]
I wouldn't recommend it if the player only wanted to make sure that certain body parts were still clothed while others aren't (such as headwear or back items). Rather, I'd go with Mackinz's proposal, and look at the code for empty.chest and empty.legs (which is found within /items/armors/penguin/empty), and see what makes them work.
@Shadow Wolf TJC: I mentioned that method because of the thread's title: "Need help to make all clothes invisible for custom race". I was operating under the assumption that his custom race was a non-standard shape and thus all clothing would look terrible on it (like how all leg parts and most headgear look very bad on the Avali race).