An assembly mountable to the transom of a watercraft, such as a pontoon boat, provides an easy-to-set up, temporarily deployable, changing room or privacy region on watercraft which do not carry an enclosed cabin. A generally Z-shaped frame is rotatably attached to a portion of the boat displaced from the deck. A boater's seat is attached on one side of the frame. A generally U-shaped curtain hoop is rotatably attached to a second side of the frame. When the bracket and seat are rotated toward the deck, the hoop is positioned in a stored position. When the bracket and seat are rotated away from the deck, the hoop can be deployed from its stored position thereby extending an enclosure fabric forming, temporarily, an enclosed privacy region for changing and the like. The fabric support member can be springloaded as can the bracket. Stowing the assembly is easily carried out by pressing the fabric support element against the bottom of the seat. This draws the fabric back against the seat. A retaining strap can be used to enclose the fabric. The seat can then be rotated down to its normal position of use.