Recolour Ivory Shorts to Black

I have a single high-resolution JPEG where the model’s ivory dupion shorts need to be turned into a true, textured black. Everything else in the photo must stay exactly as it is—no colour shifts, no lost highlights, and absolutely no haloing around the garment... (Budget: $10 - $50 AUD, Jobs: Adobe Photoshop, Color Grading, Digital Art, Graphic Design, Image Processing, Photo Editing, Photoshop, Photoshop Design)