slut-cover

Noun

cover-slut (plural cover-sluts)

1. (obsolete) An apron or pinafore, worn to hide slovenliness (such as dirt, stains, or tears) in the clothing beneath.
   • Nor let your women there appear / With dirty ſmock-ſleeves, foul head-geare, / With Cover-ſlut from Neck to Toe, / As Maids to morning Lectures go.1678, John Phillips, “Book V”, in Maronides, or, Virgil Travesty, page 15
2. (broadly, figuratively, obsolete) Any surface appearance hiding something underneath.
   • Fie, madam, you'll ruin the sex! Husband, say ye? A mere thing—a cover-slut of custom!1690, John Wilson, Belphegor, act 2, scene 3; republished in The Dramatic Works of John Wilson, Edinburgh: William Paterson, 1874, page 320