You are looking at the ARIZONA DBACKS trim that they wore a couple years back on their on field pants.
1/2 inch wide BLACK/BRICK RED/BLACK
You will get a little over 3 yards which will cover both legs and then some on a 36 inseam pant.
TRIM ONLY NOT THE PANTS!!
You just need to have your local tailor apply it to your favorite baseball pants.
This is very tough to find and is the same polyester trim the DBACKS used on these pants a couple years back with exact color scheme.