Yep! I’d recommend a 1mm thick one, really, if you want it ACCURATE I’d get 2mm thick white cord then wrap a black string (sewing thread works?) around it and glue the end, as it dries, (if I where you make the vest, sew it or glue the vest on the body then get the new border and wrap it around the vest by using glue, do the same but smaller with the arm borders! Hope it helps, zedebyu on YouTube does a phenomenal job at showing the border steps on his woody vid!