The most common Korean word for “suit” is 벌 (beol). There are 2 more words with a similar meaning — compare them below. 「suit」는 한국어로 벌.
suit (western style)
TOPIK 2 · noun
to match; to suit
TOPIK 2 · verb
Words and levels: TOPIK I essentials (National Institute of Korean Language standard curriculum, KOGL Type 1) · examples: Cheesepotato