ke·pi 
(kāpē, kĕpē)
(kāpē, kĕpē)n. pl. ke·pis
A French military cap with a flat circular top and a visor.
[French képi, from German dialectal Käppi, diminutive of German Kappe, cap, from Middle High German kappe, cloak, cap, from Old High German kappa, cloak, probably from Late Latin cappa, head covering.]