Go to the “Epic Games Launcher” and go to the “Learn” tab; scroll a bit and you should find the InventoryUIwithUMG project.
Yes, you can have a clothing system using blueprints (if you need help with how to do that let me know).
As for the tree, what do you mean?
You can paint a destructible tree mesh around the map and use that.
As for FUSE, I don’t know it too well.
Someone else will have to answer that for you.
Let me know if you need anymore help.
~ Jason