Just to be clear: Note that clothifying an object is only relevant for the Cloth room, i.e. for Poser's dynamic cloth, not for conforming clothes. And the Cloth room does that clothifying "automatically" (see the threads on the subject of dynamic clothes/cloth room).

Generally speaking, making an OBJ file look like cloth is not about modelling, except the degree that a non-dynamic (i.e. a conforming) item has folds etc modelled into it. For the rest, it's about getting the right materials settings.

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Hardware: AMD Ryzen 9 3900X/MSI MAG570 Tomahawk X570/Zotac Geforce GTX 1650 Super 4GB/32GB OLOy RAM

Software: Windows 10 Professional/Poser Pro 11/Photoshop/Postworkshop 3