The phrase "lingerie department" refers to a specific area or section in a store where underwear, sleepwear, and intimate clothing for women is sold. Full definition
Specialty lingerie or maternity stores and lingerie departments in some department stores offer this service. (babycenter.com)
It brought back memories of my daughter when she was about two singing «boobies» at the top of her lungs while we were walking past the lingerie department in Kohls on a Super Saturday. (crappypictures.com)
Luckily many leading department stores in the UK offer a bra fitting service in their lingerie department including Marks and Spencer, House of Fraser, and Debenhams. (thefashionablehousewife.com)