I think that is just it: Apart from the slouch hat or the felt campaign hat--or maybe a good straw hat in the summers--I'm not sure that any U.S. army headwear in pre-helmet days was ever very practical or even soldierly looking...? Shako--silly, heavy, uncomfortable but makes the wearer look taller and have better posture... 1825 forage cap or "chako"--silly, combines the worst features of the tam-o-shanter, beret, failed soufflé with a visor, not very long wearing... 1833 leather folding shako or "hog killer"--very hot, oh-so-clever but hideously ugly... 1839 forage cap--a nice wheel cap with a visor and little neck and ear warmer fitted to it, this one might be the "winner?" ... 1851 shako ... 1858 Hardee hat--looks smart-ish, shorn of frippery it looks like a campaign hat, allows for determination of what arm of service branch the wearer is at a glance, but proved unpopular outside the west... The forage cap or feed bag with visor... The spiked pickelhaube or "pimple hat" of zee Germans ... The pith helmet--great at protecting the wearer from the sun, but from Apache sharp shooters, not so much ...