Noddy suit
/ˈnɒdi ˌs(j)uːt/British slang (originally and chiefly Army )
noun
A suit of protective clothing, including gloves, overshoes, etc., issued for use in nuclear, biological, or chemical attacks and intended for use with a protective mask.
Origin
1970s; earliest use found in British Army Review. From a first element of uncertain origin + suit.