I think this project, Fenimore by Jared Flood, holds the unofficial record for the most different sets of needles I've used on one project. By default, with my knitting style at least, it required three: A smaller (3.5 mm) circular needle for the brim, a large circular needle (4.5 mm) for most of it, and DPNs for the top. However, I started to experiment with different set-ups to see which I liked the best, since I've been buying a lot of new needles lately. I used a fixed KnitPro Nova circular, a fixed Addi circular, an interchangeable Prym/KnitPro circular, a longer KnitPro Rose for magic looping, and an Addi Lace Click circular (at two different lengths, 40 cm and 50 cm). And the KnitPro Symfonie DPNs. The wooden ones I found too slow. I did not like magic looping a circumference this large. And I preferred the Addi Lace tips to the regular Addis for cabling without a cable needle (and for everything, really, I can't think of an occasion where I'd want blunt tips). The fixed KnitPro Nova needles were also good, but I only had them in the smaller size, so I could only use them on the brim. This, naturally, sent me to an online knitting supply store to buy some more needles.
The pattern was fun to knit (easier than it looks, and fast, too), but I'm not crazy about the end product. I did not stretch it during blocking, but I'd still like a more fitted style. So, it's probably going to be gifted. But I do love how the pattern is integrated into the crown decreases seamlessly. Guaranteed Jared Flood quality.