According to Charles Thompson's book;

"..on the Glengarry bonnet the ribbons are always left hanging loose. With the balmoral there is some disagreement. Some of the experts insist that the ribbons of the Balmoral should always be tied in a neat, small bow. Nobody says it is wrong to knot [in a bow]the ribbons; some just feel that you don't need to. You will be safer to knot the ribbons. Most people do, and nobody objects to it. I have even heard the romantic notion that knotted ribbons mean that the wearer's affections are engaged, while free-flowing ribbons mean that his fancy is equally free." Thus speaketh Obi-Wan Kilt-Nobi.

here are the picture of my bow. I've tried to capture the tieing of it, but black ribbon on dark green is a bit tough.

here is how a Glengarry Hats Balmoral comes

I tie a half-granny knot

loop the lower tail and bring the upper tail in front

push the upper/front ribbon diagonally up to form the second loop

pull and shape so the loops and tails are about equal length

and another


hope these show sufficient detail. i think the key is the first step. it sets the foundation for the horizontal bow.