Start with the bowtie lying face up. Adjust the bowtie so right side is shorter than the left. 
Move the longer end to the right side, across the shorter end.
Bring that same longer end under the shorter end and up through the neck loop.
At the joint, fold the shorter end towards the right and then towards the left to create the bow shape.
Bring the longer end stra­ight down over the middle of the bow shape.
Fold the longer end back towards the chest and pinch the fold.
Push the pinched end  through the loop behind the bow.
Pull on the folded parts of the bow to tighten.
Adjust until balanced on both sides.