the.com/slicker
A raincoat for your body or a con artist for your wallet — both keep you exposed.
means A smooth-talking swindler, a long waterproof coat, or anything that makes a surface more slippery.
from From the verb 'slick,' rooted in Old English 'slician' (to make smooth); the 'smooth operator' sense oiled its way in by the 1800s.
City slickerCoined to mock urbanites baffled by rural life.
Yellow uniformClassic fisherman's slicker came in oilskin yellow.
Double meaningSame word warns you and shelters you.