I wouldn't say no flaps... I did some major slipping with my Kadet Sr equipped with flap with flap settings from 0 deg to 80 deg deflections. The flaps helped maintaining stability... but the airspeed sure bled off quick at higher deflections. (which is why I wanted the flaps down anyway)

Nothing quite as interresting to watch as a 60 deg angle between fuselage and runway (and ground path) just prior to touchdown. You do have to know the airplane before you try it.

Rudder is held as if trying to turn downwind, ailerons as if upwind in a normal slipping crosswind final approach. The rudder is helping hold the nose up as a portion of the wing's lift is being used to counter the croswind.