in general: Cloth Room is a real world simulator.

So pieces of cloth which in life are not stichted together (like: blouse, jacket, jeans, belt) should not / need not be in one continuous 3D mesh. The can be in the same sim.

Pieces of cloth which in life stick together and effect each others movements (like the chest, hip etc parts of one dress) must be in one continous mesh. If not - like in your example - the mesh need some repair - as you did. A lot of clothes are prepared well, by the way, and do not need further treatment.

Pieces of cloth which stick together but not affect each other mutually - like a thick lether belt and a piece of thin linen attached to it, the belt affects the linen but not the other way around - can be fixed as one mesh but can also be handled by putting the elements in different sims (here: belt first, then the linen with one row of vertices constraint to the belt).

As long as the mesh does not need improvement, parts of comforming clothes can be picked directly for clothification and do not need to be saved as props or whatever first.

All the best.

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Usually I'm wrong. But to be effective and efficient, I don't need to be correct or accurate.

visit www.aRtBeeWeb.nl (works) or Missing Manuals (tutorials & reviews) - both need an update though