To add a bit, at https://en.wikipedia.org/wiki/Caproni_Ca.161
you'll see the plane. Pezzi set the record twice, the first being in a pressure suit in an open cockpit, and the second time in a new version of the plane. This, the Caproni Ca.161bis, had the cockpit sealed with the pilot in a pressurised and heated suit as well. https://en.wikipedia.org/wiki/Mario_Pezzi_(aviator)
In between Pezzi's records, a Brit called M.J. Adam took the record in a Bristol 138 monoplane - the record not being specifically for bi- or mono-planes.