This is a built-in plugin in Roblox Studio that allows you to preview and adjust how hats, hair, and back items sit on a character model. You can manually drag and rotate items to create "custom" combined assets.
If you're making content (like a video or a showcase game), focus on these popular "no-script" trends: roblox best Character Customization [no scripting]
Search for "Custom Character Outfits" or "Outfit Loader" models. Many of these are pre-configured "Click to Wear" stations that let you set up a shop without needing to understand the underlying code. This is a built-in plugin in Roblox Studio