No, not Monkey Kung Fu (obviously written by a practitioner), nor Monkeybone, the Brendan Fraser flick, nor The Monkey's Paw, the W. W. Jacobs short story we read in high school. The Monkey's Fist. It's an old sailor's knot repurposed by clotheshorses as a casual fastener for French cuffs. To wit:
Those shown came with the Brooks Brothers shirt, but I'm fixing to buy a set of many different colors. Why? Well, as you may know, my wardrobe evolved over the past several years in an ecosystem of daily suit-and-tie wear, with French cuffs optional. Like "black tie optional", I interpreted "French cuffs optional" as "French cuffs? Hell, yeah!" The new job is somewhat more casual, on average, with a lot of variability. Meanwhile, I have approximately 0 business casual items, so almost all my dress shirts are French cuffed, but metal studs seem too formal on a day with no tie.
Enter the Monkey...Fist.