Caoutchouc kepi

• caoutchouc: (French) rubber; raincoat (obsolete)

• kepi: a military cap with a flat or forward-sloping circular top and a horizontal peak or visor (primarily associated with the French military and police, as well as with the American civil war; some were made from rubber)

• HCE is putting on his seven pieces of clothing, suitably waterproof for a happygogusty April morning of potentially stormy conditions, that is, of showers and exposers. Cf.great belt, Hideinsacks, blaufunx fustian, Ironsides jackboots, Bhagafat gaiters and rubberised inverness