After modeling and texturing your asset, you can begin the process of exporting your Blender project as a .fbx or .gltf. For up-to-date settings, see Export Settings.
If you are creating your own accessory object, it's important to clean up your project, which can involve deleting or removing any extra objects, such as lights, cameras, or mannequins, to ensure you only export the accessory mesh, and applying any modifiers to your mesh object.
To export your model as a .fbx:
In the topbar, click File.
Select Export, then FBX (.fbx).
On the right-hand side of the file view window, change the Path Mode property to Copy, then toggle the Embed Textures button.
Set the Transform > Scale to .01. This is required to maintain scale size for .fbx exports.
Click the Export FBX button.
You've completed the exporting section of this tutorial. If desired, download a reference sample of this exported file for comparison. You can use this reference in the next importing step.