This jacket is called a patch pocket jacket because the whole pocket is sown and visible on the outer side of the jacket. As if it has been patched on. Think about when you apply a sticky plaster/ band aid to a cut. In essence you're patching the cut. The same way with a patch pocket jacket. Patch pockets are almost always done on the side and breast pocket. Just to give it that uniform look. What I have seen, which is interesting, is a ticket pocket that is patch. Sounds incongruent but it does work and can be pulled off.
Flap pockets with the breast pocket as patch.
A patch ticket pocket.
Patch pocket in action. Notice the English hunting collar.
My very own grey flannel patch pocket jacket.
PG: Man to man, generation to generation.