How to Sew Patches Onto Areas w/ Pockets - Levi's Jackets

Hello, I am in the process of making a Battle Jacket and have seen many of you on here with Levi's jackets where the patches are sewn on top of the pockets near the bottom of the vest. How do you guys do it? Any recommendations on technique? It seems a bit daunting. Thank you for any and all help!