sackcloth vs garment

sackcloth and garment both are nouns.

Word	Noun	Adjective	Verb	Adverb
sackcloth	Yes	No	No	No
garment	Yes	No	Yes	No

As nouns, garment is a hypernym of sackcloth; that is, garment is a word with a broader meaning than sackcloth:

sackcloth: a garment made of coarse sacking; formerly worn as an indication of remorse
garment: an article of clothing

sackcloth (noun)	garment (noun)
a coarse cloth resembling sacking	an article of clothing
a garment made of coarse sacking; formerly worn as an indication of remorse

sackcloth (verb)	garment (verb)
	provide with clothes or put clothes on