I don’t know of a specific reference for soft cods. In canon Scout Troopers and Darth Vader are examples of different types of soft cods. Soft cods of just fabric or fabric with small segmented plates for flexibility have been done. Studying photos of kits will probably give you the best examples. Pilot kits tend to have soft cods and you may find examples there.
As to the boots those would be too “earthy.” Even with the toe plate covering and the laces covered they would be very recognizable. There are many shapes and labels that would need to be altered or removed to change the silhouette of the boots enough not to recognize them.