You can create Bullet soft bodies from Maya polygon meshes. When a soft body is created, a new mesh node, identified by the original polygon object name, suffixed with Solved is also created.
This object is the mesh that is deformed by the Bullet soft body simulation. Polygon planes work well as cloth soft bodies, although any polygon mesh can be used.
To create a soft body
See Soft Body Properties for information about configuring soft body options and Create a cloth simulation with Bullet Soft Body for an example Soft Body workflow.