Jackie Kennedy’s pink suit, worn on the day of President John F. Kennedy’s assassination, is one of the most heartbreaking reminders of the horror of Nov. 22, 1963. But it won’t be seen again until at least 2103 — or perhaps ever.

The National Archives confirms to PEOPLE that Mrs. Kennedy’s double-breasted wool suit is being held from public view in a custom-made, acid-free box with temperature and humidity control at the National Archives and Records Administration’s College Park facility in Maryland.