Cant add shirt to Dummy

Hi everyone, I’m trying to import a shirt by scripting.
For example i want to import this WHITE BLACK SWEATER WHITE BLACK SWEATER WHITE - Roblox shirt. When I write the ID of this shirt, It doesnt work. But when I put the ID of the source template (WHITE BLACK SWEATER WHITE BLACK SWEATER WHITE - Roblox – library version) it does work. How do I fix it so it does apply for normal shirt?

I basically want to get the main URL of the shirt.

It seems like I have fixed the issue by my own way.