The good old bow tie, allegedly not invented by Charlie Chaplin.

Start with the one end in the left hand extended about 1 and half inches below that in the right hand

Cross the longer end over the shorter one and pass up through the loop

Form the front loop of the bow by doubling up the shorter end and placing it across the collar points

Hold the front loop with your tumb and forefinger of your left hand. Drop the long end down over the front

Place your right forefinger, pointing upwards, on the bottom half of the hanging part. Pass up behind the front loop

Poke the resulting loop through the knot behind the front loop. Even the ends and tighten.