How To Insert a Shirt Object?

Hello, So I have been working very hard at clothing for characters in my game. There is one problem with this... I have been using the shirt template to create these assets as to apply them through "retexturing". The only problem is, I can't create a shirt through the Insert function, so how would I go about creating a shirt to insert into these dummies? Thanks for reading! :)

Sorry for the very late answer, but type this in your command bar: Instance.new("Shirt", game.Workspace)