"Oh," Jack says, surprised and flattered by the compliment. "Yes," the corners of his mouth tip up into a small smile. "granted I do have a lot of time on my hands these days, but it's not so difficult. The skill is in keeping the back clean-" Jack turns over the handkerchief, showing that the design on the back nearly matches the front. "If you're not careful it can become a big knotted mess."