Does anyone know what episode it was when one of the ladies, I think Shirley, got caught using the Hubba Hubba Heiney to make her backend appear larger?

I believe it was the Season 5 episode "Upstairs, Downstairs." In that episode, Shirley had ordered the "Hubba Hubba Heiney" and Laverne ordered the "Make Him Glad to be Bad Nightie" and matching "Scanty Panties."