Just to mention: the AOE3 fortress age musketeer did not really have a typical tricorne, but a deformed one, more like a half-folded wide-brim cavalier hat (which is how first tricornes are made though). In DE with higher quality model that is more obvious:
In a recent patch they finally updated it to a “true” tricorne which looks great, and really meets the 18th century hype:
I hope similar changes could be done for AOE4 in later updates as well.