I usually wear a large or a medium, depending on the brand, so I used the what-size-am-I option. I got a large, which should probably be re-labeled as "Sized for fat men with short arms."

When Bonobos says this is not-too-boxy, they mean it's too boxy.

From Bonobos: Yikes, Reid. Sharing this review with the product folks. We're always looking to improve so comments like this are helpful, if temporarily hurtful. Thanks for the feedback!