"Wearing a belt is not comfortable."
Translation:허리띠를 차는 것은 안 편해요.
Unlike English, there are many different words for 'to wear' in Korean, depending on the object:
입다: for 옷 (clothes) such as 스웨터, 치마, 드레스 (sweater, skirt, dress)
신다: for things you wear on your feet such as 신발, 양말 (shoes, socks)
쓰다: for items you wear on your head such as 모자, 안경 (hat, glasses)
매다: for things you tie or fasten such as 신발 끈, 넥타이 (shoelaces, neckties)
메다: for items you sling over/wear on you shoulder, like 가방, 배낭 (bag, backpack)
끼다: for things you wear on your hands or fingers, for example 반지, 장갑 (ring, gloves)
차다: for items you wear around a limb, like 시계, 벨트 (watch, belt)
(1) 은/는 Topic tags are used for "attribution" (characterization/categorization)
허리띠를 착용하는 "것은" 편안하지 않습니다
= Lit. The wearing-a-belt "thing" is not comfortable
= Wearing a belt is not a comfortable thing
= Wearing a belt is not comfortable
implying "not comfortable" is a general characteristic of "wearing a belt"
(2) 이/가 subject markers are used for "identification"
허리띠를 착용하는 "것이" 편안하지 않습니다
= Lit. It is the wearing-a-belt "thing" that is not comfortable
= It is uncomfortable to wear a belt
identifying "wearing a belt" as something which fulfills the condition "is uncomfortable "
(1) "-기" is used to nominalize the attached verb i.e. to transform it into a noun which then can be described by the final verb.
The final verb describes a nominalized verb.
In English, the nominalized verb is often represented by either a gerund (V-ing) or an infinitive (to V)
허리띠를 차기 안 편해요 = Wearing a belt/To wear a belt is not comfortable.
Note: Here, the subject of the final verb "is not comfortable" is wearing/to wear a belt.
(2) "-는 것" means "That which is". The "which is" introduces a relative clause that is the abdominal adjective represented by -는.
What that means is -는 transformed the attached clause into a clausal adjective which then modifies 것 (that/the thing).
The final verb in this case describes 것.
허리띠를 차는 것은 안 편해요 = Lit. That, which is wearing a belt, is not comfortable = It is not comfortable wearing a belt [=> Wearing a belt is not comfortable (by inference)]
Note: Here, the subject of the final verb "is not comfortable" is "It".