The content ID link pointing to the ShirtGraphic texture hosted on the Roblox website. This property sets the texture associated with a t-shirt.

Finding the ID

This content ID is different than the website URL of the t-shirt. It can be found by pasting the website URL of the t-shirt into the Graphic property of the ShirtGraphic in Roblox Studio, as Studio will correct it. Alternatively InsertService/LoadAsset can be used to insert the t-shirt into the workspace, for example:

local webURL = "https://www.roblox.com/catalog/2591161/Sword-Fight-on-the-Heights-Ring-of-Fire-T-Shirt"
local assetId = tonumber(string.match(webURL, "%d+") or 0)  -- Extract the number

local success, model = pcall(function()
	return game:GetService("InsertService"):LoadAsset(assetId)
end)

if success then
	model.Parent = workspace
end