You, can do a limited amount of modeling in Poser with primitives. However if you want to make props and clothing you need a modeling program. There are some good free modelers out there. Clothing modeling is not something you can do over night though. It takes a lot of practice. You might want to start out more simply, making thing like props. Not to discourage you. Some of the free modelers:Anim8tor,Strata3d,Blender and I think they are giving away an older version of Amapi. I'm sure there are more out there. hope this helps

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"The true sign of intelligence is not knowledge but imagination".

Albert Einstein