I’m very process-driven and I love pattern making. A lot of architects, artists, and designers through history have used golden ratio in their work, including Leonardo Da Vinci, Salvador Dalí, and Le Corbusier. It's not talked about as much in fashion, even though the human body follows this ratio quite closely. Try this experiment at home, measure your height in centimetres, from the floor to the top of your head (A), then measure from the floor to your belly button (B), (A) divided by (B) should be very close to the golden ratio aka Phi (1.618…) see how close you are! You can also divide your height (A) by the golden ratio to find (B).
One last one to try: outstretch your arm, measure from your shoulder to your fingertips, call this measurement X, divide X by the golden ratio and you will find your elbow to fingertip measurement (call this measurement Y). Now divide Y by the golden ratio and you will find your wrist to fingertip measurement (call this measurement Z). Now divide Z by the golden ratio and you will find your knuckle to fingertip measurement. This pattern continues as you go down each joint. I find this a pretty compelling reason to use this ratio in clothing, being that it is so ingrained in our bodies.