Sam gets up from bed and puts his pants up to his waist, a second later he repeats the movement from another angle.
During a scene with Sam Loomis and Marion Crane, Marion dresses in front of a mirror, putting on and buttoning her pant suit jacket. After returning to Sam, the camera shot from behind shows that she is no longer wearing the jacket.
Marion Crane has a suit on and then off around 16:53.
When Marion Crane goes into the bathroom she is seen putting a jacket on over her dress. When she leaves she is still wearing the jacket. She then hugs Sam and as the camera switched from front to back her jacket disappears then re appears then disappears.