An orthopedic casting slipper kit for custom molding of a foot impression including a low-cut impression slipper shaped to extend upwardly on a patient's foot from a plantar surface of the foot to an open end. The impression slipper is made from a fabric that is sufficiently resilient so as to enable the impression slipper to substantially conform to the patient's foot. A support element is coupled to the impression slipper and extends around at least a portion of the patient's foot for holding the impression slipper snug against the patient's foot. A quantity of curable resin is provided for impregnation into the fabric of the impression slipper and is sufficient to harden the impression slipper into a cast foot impression.