I own a labymod cape and when i use this cape template (https://workupload.com/file/Ktzt94ZL) in minecraft (https://workupload.com/file/QJzrZBx6) it does not quite fit. Is this with you and someone has a template that fits exactly?
On the side of Labymod you can download one.
https://www.labymod.net/download and dan you kicks on "Cape"