The Glennie Double is a very unusual knot that was invented by Eric Glennie. Not only is it tied in an unusual style, but it is actually two knots on your tie. I only recommend wearing this knot if you are very confident in what you are doing. It is for advanced users only. If you are a large or tall man (or woman) you may want to bring the support of a vest or suit/jacket to make up for shortness. Warnings aside, this knot looks super interesting with stripes and certain designs, especially vertical designs or contrast ties.