You just touched on a subject of special interest to me. I love handmade buttonholes, and have always taken an interest in how my various tailors did them. There is a huge amount of variation, especially between the minimalist Italian buttonholes of a summerweight Kiton, and the industrial-strength hawser-sewn buttonholes of a Savile Row tweed suit. About two years ago decided I was going to learn how to make them. Found a book, took the sleeve of an old wool flannel shirt, and started practicing. Counting all the various thread types I experimented with, I made 33 practice buttonholes on that sleeve over the next three months. Embroidery thread, silk thread, cotton "buttonhole" thread, gimp, doubled, not doubled, keyholed, and non-keyholed. I also searched a variety of Ebay auctions and printed out close-ups of Brioni, Dege & Skinner, and Oxxford buttonholes. Finally, I did a lapel buttonhole for real (it took an hour). I proudly took it to my tailor, who pronounced it totally unacceptable, and showed me how he did his buttonholes-- beautifully, with everyday thread, without gimp, with a fanned keyhole and a flawless ridge, in about 5 minutes. After that I tried another 5 or 6 practice buttonholes, then did another real lapel buttonhole, which my tailor offered to "repair" when I showed it to him. I did one more, whereupon my tailor suggested that if I didn't stop defacing my clothes he was going to stop working for me. Now, on those occasions when I get the itch, I don't show him the result. They still take me about 30 minutes each, and they look, well, okay, albeit unquestionably handmade. One additional caution: you can't undo an unsatisfactory buttonhole and start again. The process of unraveling a tight buttonhole causes considerable fabric trauma. You only get one shot. Take it from me: good buttonholes are the final skill of a journeyman tailor, and are not an easy skill to acquire. If you want to learn, there are any number of online resources (do a Google image search under "buttonhole") but be prepared to practice a lot before you start stitching up your first real suit. As an alternative, I might suggest that if you're looking to give RTW suits an aura of bespoke, learn to topstitch the lapels and edges-- it's a pretty simple skill to learn, and much more apparent to the casual viewer.