Yes, an overcoat is a thing. Yes, the word overcoat is a noun.
The common nouns in the sentence are necklace and overcoat.
The noun is tree, a word for a thing.
A noun is a person, place, thing, or idea. Soup is a thing. So, yes it is a noun.
Yes, a number is a noun, a year is a noun; a number is a thing, a year is a thing.
Yes, ape is a noun because a noun is a person, place or thing. An ape can be considered a thing.
The common nouns in the sentence are necklace and overcoat.
An overcoat
It is a noun. It has become a generic name for a waterproof overcoat but it is also a proper noun, requiring a capital initial, (i.e. 'Mackintosh') when referring to the Scottish manufacturer of rainwear.
The Overcoat was created in 1842.
The duration of The Bespoke Overcoat is 1980.0 seconds.
The duration of Chicago Overcoat is 1.57 hours.
Button Up Your Overcoat was created in 1928.
The Bespoke Overcoat was created on 1956-10-07.
Chicago Overcoat was created on 2009-10-10.
Joseph Had a Little Overcoat was created in 1999.
The answer is an Ulster, a type of loose-fitting waterproof overcoat
It is a Petersham overcoat.