Does anyone know how I would model a pile of clothes like the attached image in rhino
I would say it is almost impossible – or at least impractical. You could try to model it: just make the base shape of each clothing and start to deform it, but the real solution for this geometry would be simulation.
If this is a learning goal, I’d recommend you start with SubD models, and then you sculpt them for more realistic and detailed wrinkles.
If this is a business goal, you can just buy them:
these are usually scanned by taking several pictures from around, using software like photoscan to generate a mesh with the texture applied. its a pretty fast and common method. if it has to be individual 3d i agree with Konrad, modeling each part with applied texture and using cloth simulations to stack them over each other.
modelling it as an entire stack as Gustavo suggest may be a bit tricky when it comes to texturing. of course you can paint the texture onto the mesh at any time but that needs quite a bit artistic patience and generating realistic textures by hand might not be so easy.
if it can be a quick and dirty job you could take a picture from a pile from above then apply it to a picture frame or surface then simply warp it up as a heap and keep modeling the edges out for more detail, either as as Gustavo suggests with SubD or just by dividing a Nurbs or even mesh surface gradually deforming it while adding details.