Apparatus for magnetically holding a shirt collar in a position and orientation on a shirt front, includes a collar stay attachable to a collar via adhesive or the like, or receivable in a pocket of the collar. The collar stay includes a material attractable by a magnet and can include at least a peripheral edge portion of a polymer material to protect adjacent shirt fabric. A magnet is positionable against an inside surface of the shirt front opposite the collar and is magnetically attachable to the collar stay through the shirt front, for holding the collar in a desired position and orientation. Suitable polymers include plastics and rubbery materials, and can be elastic so as to be stretchable over the stay. The stay can also be a laminate or composite of the material attractable by the magnet and the polymer, and can be bendable or foldable into a desired shape.