A few warnings before clothifying conforming clothing (all or part):

Use a preview mode that shows the wireframe (hidden wireframe is often best) to check the mesh before trying to clothify.

• If the mesh intersects the character or doubles back on itself (as are often the case when the creator has added "thickness" to the cloth), then the Cloth Room will either freeze, abort or throw conniptions.

• If the mesh has long, thin polys then the Cloth Room won't be able to bend them convincingly.

• (not so easy to see beforehand) If the part to be clothified is not connected to the main mesh (lace frills and the like often fall into this category) then those parts will fall away from the rest of the mesh when clothified. Can be partly rectified by constraining the edge of the offending part, but that's time-consuming to do.

Also, there may be problems if the clothified part (after running the Sim) intersects the conforming part. I'm not sure what would happen if you set the dynamic part to collide with the conforming part..

Having said all that, don't be put off experimenting! I've had wonderful fun in the cloth room!
(And am working on learning how to create dynamic clothing - making some good progress so far)

Cheers,
Diolma