This paper describes a successful treatment to reduce foxing stains on a pair of men's linen underpants ca. 1830 in the collection of the Costume Institute at The Metropolitan Museum of Art. The underpants are ankle length and have a wide corset-like wastband containing 12 baleen stays. Such undergarments are rare in museum collections, yet provide a reminder of the importance of fashionable bodies for men. Foxing stains can be disfiguring on any work of art, but the stains were considered particularly distracting on the underpants. While foxing stains are a common problem in textile collections, most recent studies have focussed on paper collections. Building on research by paper conservators and scientists, this treatment addressed the metals and microorganisms that cause foxing stains. Rather than use bleaching agents, the underpants were wet-cleaned in a series of baths with the chelator ethylenediaminetetraacetic acid (EDTA), a lysing enzyme, and the surfactant sodium lauryl sulfate. An agarose poultice with hydroxybenzyl ethylenediamine (HBED) was used to target an area with dark stains. In both visible and ultraviolet light, the stains showed considerable reduction after treatment.