How do I make a script that will spawn a character with a morph according to their group rank?

I play a lot of Star Wars games on Roblox and I noticed that you receive a uniform based on your group rank, as soon as you spawn. I attempted to script something that would do that, but I only made it to spawn players with shirts and pants according to group rank. I need help completing the hat section because the hats are not located on the Roblox catalog. -Zootopia510