patch pocket
US /ˈpætʃ ˌpɑː.kɪt/
UK /ˈpætʃ ˌpɑː.kɪt/

1.
a pocket made of a separate piece of cloth sewn onto the outside of a garment
:
•
The jacket has two large patch pockets on the front.
•
She added a decorative patch pocket to her skirt.
a pocket made of a separate piece of cloth sewn onto the outside of a garment