The Bra Peddlers is about Madison Avenue ad men scheming to sell a new product from Venus Bras: the Up-Cup, a falsie bra that will make flat-chested woman rise, or women who are too big squished down to conventional, less “cow-ish” size. The material, when touched with clothes over, will fool any person that it’s a real breast — they even have nipples!

Ted Griffen, a Madison Avenue ad man, has been promoted from sporting goods and gets the Venus Bra account. Venus's latest product is the Up-Cup, a bra that will make flat-chested women appear more endowed and over-endowed women appear more perky. The downside is that part of the promotion is the understanding that Griffen's wife Hazel will have to have sex with Griffen's boss whenever the boss asks. Now second in command, Griffen urges Hazel to comply, and she agrees. She wants a better life for her family, and she doesn't want her husband to get fired if she says no. Also, she has had an affair in the past, and he uses this information to pressure her. His own long-running affair with his secretary and occasional sex with other coworkers is not a consideration...

However, when one of his coworkers commits suicide after he has sex with her, Griffen begins to feel his conscience. So, when he learns that the material in the Up-Cup may cause breast cancer, he feels the product should be shelved. However, Venus Bras and his boss want to go ahead with the product despite the risk, and Griffen loses his job. He goes home to his wife, and they decide to give their marriage a renewed commitment without the temptations of money.