Abstract: A deployable rain pants assembly, for use by a user having a waist and legs in protecting everyday pants from the rain, including a belt and a pants portion. The pants portion is initially stored near the belt, which is worn around the waist until needed. The pants portion has a top edge, a bottom edge having ankle openings, a pair of pant leg portions, and a waist band having a waist band front and a waist band rear. A pair of main seams extend from near the bottom edge to the waistband and selectively join the pant leg parts, and join the waist band front and waist band rear. Once the pants portion is deployed downwardly from the belt, the waist band rear is tucked between the legs, the user steps through the ankle openings, and main seams are joined to encase and cover the everyday pants.