For example, the following two images are close-ups of the arms of a soldier character I'm designing, first without and then with a patch applied at the joint between the upper arm and forearm.
Here's without a patch; the stroke of the forearm is visible and so is all of the camouflage pattern on the arms.

But then with the patch, the stroke and the camouflage disappear, leaving a large circle that awkwardly breaks up the camo pattern.

I was under the impression that patches only hid the strokes of anything above the target layer and beneath the patch itself, not any vector shapes as well. Is there any workaround to this, with the patches themselves, with the layers, or with some other fix that provides a patch-like effect? I still want that effect of hiding the strokes so it looks like it's all one shape, but I don't want that massive circle that erases all of the camo shapes.