The jackets on the market are woefully inaccurate. I understand that they whipped them up based on trailers, previews and what pictures were available. But you can see that what the mass produced jackets interpreted as perforation was the screen-printed design on the body. The bicep strap is actually threaded through oval grommets, not a strap that goes completely around the arm. That's just what I noticed at first glance.
Wes
Welcome! There are a number of star lord build threads in this forum, I suggest you browse through them to familiarize yourself with how other builders have crafted their props. As for painting silver, me and a number of other folks have had good luck with a substance called Rub N Buff. Look into that and see if it's something you could possibly use.