This is a very simple, very quick tie to create a harness high on the chest which can be used as an anchor point for further tying.

Starting from back, thread center bight forward under one armpit, up over same shoulder, across back of neck, down front of opposite shoulder, back under second armpit. Align bight and behind-the-neck rope in center of back between shoulders, and pull long end of rope through both, forming an X. Lock off with half-hitch.

Optionally, use remaining rope to lock together shoulder wraps across the front of the chest.