The McKinley Museum’s underwear is showing.

You might think a presidential library and museum would be a pretty staid place, but it’s letting its hair down with Mentioning the Unmentionables, an exhibit that explores the evolution of women’s undergarments from 1810 to the turn of the 21st century.

Appropriately enough, the exhibit is sponsored by Ambiance, a chain of stores that specializes in intimate apparel and, ahem, related products.