NPC Shirt Is Not What I Picked?

So Basically I Made A Walking NPC Script And I Wanted To Add Random Shirts From My Table, I Went Online To See Some Answers and saw:

Functions and variables

shirts = {6922626706, 6706140296}

local randomshirt = math.random(1,#shirts)
local clothing = npc.Shirt

function format(Id)
	return string.format("rbxthumb://type=Asset&id=%s&w=420&h=420", Id)
end

Change Shirt

clothing.ShirtTemplate = format(shirts[math.random(1, #shirts)])

Also I didn't do this in separate scripts

Problem Is When I Test The Game The Shirt, Is Not What I Expected. It had a sphere dummy head and a black thing on the waist?

And Also The Shirts Arent The Problem.

Please Correct Me If I Am Wrong, Do I Need A Remote Event/Function/Bindable?

And Just To Remind You, Stay Safe!

EDIT: ** Sorry To Waste Your Time But Actually The Image Was The Shirt But A Dummy Wore It XD**

I believe that you are putting in the wrong shirt / pants ID's. Insert a shirt into workspace. Paste the link of your shirt and then copy the asset ID from there inside. The shirts should attach to the NPC afterwards.

Sorry To Waste Your Time But Actually The Image Was The Shirt But A Dummy Wore It XD