Leather kinks have reached the mainstream
Obviously, harnesses have been around forever whether as a gun holster, safety harness, horse harness, etc.
But if you’re wearing a harness for non-safety measures, it’s most likely you’re preparing for a kinky night. Harnesses are mostly associated with the BDSM sex scene as well as the gay leather scene, which has been around since the 1950s.
Now, I’m not saying Virgil Abloh was frequenting the leather bars, but it wouldn’t be surprising if a kinky mind made its way to high fashion.