Caoutchouc kepi

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

• kepi: a forward-sloping military cap used in teh French army

• 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