Hi Ravi, what you want to do no 3D software can do. When modeling its up to the modeler that need to keep the mesh like he imagine. The only way to do what you want without modeling is creating a flat bag and add softbody in animation. Theres a free plugin from SparrowHawk that cna do this in Carrara, but when modeling you need to keep what you want when pushing and pulling polygons, other control her ein the modeler side is about UV maps, they control how the texture look and is applyed to the mesh too.
Look a lot of models here in RO, no one use softbody to create, just control everything by hand. I think that the frst thing you need to do is find a reference, so you can model what you really want, dont try to do only by mind until you are a expert in model.

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