It depends on the clothing and how it was built. If there are a lot of detached decorations, then it may end up being more trouble than it's worth. The easiest way is to take the garment into the fitting room and spawn a prop. You'll need a second figure in the scene to stand in as the goal but since you aren't doing any fitting, it can be any figure.

You can also export the clothing as an obj and re-import it. I prefer the fitting room because it retains shaders and doesn't leave a file on my hard drive that I have to remove later.

Sometimes the body part aren't welded and the clothing will fall apart in the cloth room. If you want to use the fitting room method, you can try converting the clothing to simple bones single skin (figures>skinning method) but most likely you will have to take the clothing into a modeler and weld it there.

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