I always have to "sew" clothes. When I see something like that and have determined it's not a normals issue, I do a wireframe view of the prop and pull out the morph tool. I use the single point brush and reduce the magnitude to .1 or lower. Then, in the prop, I pull up a vertice of the hole to cover it. Sometimes, I have to do with more than one vertice. Sometimes, also, I have use the flatten brush (a small one) to "iron" the polygons together. Of course, this is just for small gaps like the one you've shown.

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W11,Intel i9-14900KF @ 3.20GHz, 64.0 GB RAM, 64-bit, GeForce GTX 4070 Ti SUPER, 16GB. 

Old lady hobbyist.

All visual art or fiction is "playing with dolls."