Such as, am i allowed to use hairs made by roblox up on the catalog or accessories made by roblox. And with clothing am i allowed to use any by free will? Can you please let me know <3
Yes. You can just copy and paste the link of the catalog item you want to use and you can paste it in ROBLOX Studio on the Accessory, BodyColors, Pants, Shirts, or ShirtGraphic, in Explorer in their properties or you can paste it in Game Settings and click Avatar and scroll down to Override Player Choice and you can paste it in where it says ID Number.
Yes you can. Yeah you can get plugins for this too
You can get every catalog items for permission if the owner enabled "On Sale" option. Even it needs Robux to buy it or not, if it's on sale, then you have the permission to get it and use them freely as long as the catalog item is not breaking the Terms and Service. Changing or misleading the peoples about the item or claiming it's your own (Community Guidelines Rule 6, Impersonation and defamation.) will break the Community Guidelines and get a ban.
Do not copy, transfer, display, or otherwise use the UGC of other users outside of Roblox.