Got the grey flannel Fox Bros. newsboy cap in. I ordered the 59cm and fit is great. Snug, but not tight. For sizing info, I'm typically a 7 3/8 for fitted hats and head measures pretty much exactly 59cm, so I'd say these fit TTS for the metric measurement.
Really wonderful hat too. I'd been on the lookout for a newsboy hat and the intersection of NMWA and Fox Flannel fit the bill perfectly.
Now I notice there are other colors...