This knot is one loop more complicated than the Half Windsor, so it's two more complicated than the Four in Hand. It's a large, symmetrical knot that's good for thin ties or wide collars.
Step 1: Ready?
Step 3: Loop 1
Step 5: Loop 2
Step 7: Through
Step 8: Tighten
Then bring the knot up to the collar by pulling up on the knot while you pull down on the narrow tail.
Repeat these two motions as necessary.
You may also need to tidy up the knot by pulling down on the front of the outermost loop so that it fully covers the loops around the arms of the Y.