Through The Window — Bridy McAvoy

When Delia's husband asked her to undress in front of the bedroom window, with the lights on and the curtains open, Delia was glad their house backed onto open woodland.
Three days later after she'd dropped him at the airport, ostensibly on his way for a business trip, she found a package with some incriminating pictures of her impromptu striptease, and two complete outfits together with some detailed instructions.
Convinced it's her husband playing one of his little ‘role-playing' games, she goes along with the voice on the phone. It's only when's she naked she starts to really have doubts, and by then it's very deliciously... too late.