chimaboda cheongbajiga deo pyeonhaeseo yeohaeng gal ttaeneun cheongbajiman ibeo.

보다 is the particle used to mark the thing being compared: than.

So:

• 치마보다 = than skirts
• 청바지가 더 편해 = jeans are more comfortable

Together, 치마보다 청바지가 더 편해 means jeans are more comfortable than skirts.

A simple pattern is:

• A보다 B가 더 + adjective
  = B is more + adjective than A

Example:

• 커피보다 차가 더 좋아.
  Tea is better than coffee.

Using 가 here highlights 청바지 as the thing that has the property more comfortable.

So:

• 치마보다 청바지가 더 편해서...
  = Since jeans are more comfortable than skirts...

If you changed it to 청바지는, it would sound more contrastive or topic-oriented, like you are setting jeans up as the topic in contrast with something else.

In this sentence, 가 is very natural because it focuses on what is more comfortable.

Very roughly:

• 청바지가 더 편해 = It’s jeans that are more comfortable
• 청바지는 더 편해 = As for jeans, they’re more comfortable

더 means more.

In comparatives, Korean often uses:

• A보다 B가 더 adjective

So here:

• 치마보다 청바지가 더 편해
  = Jeans are more comfortable than skirts

Sometimes 더 can be omitted if the comparison is already clear from context, but keeping it makes the comparison explicit and natural.

편해서 is the -아서/어서 form of 편하다 and here it means because (it is) comfortable / since (it is) comfortable.

So:

• 편하다 = to be comfortable
• 편해서 = because it’s comfortable / being comfortable, so...

In this sentence:

• 치마보다 청바지가 더 편해서 여행 갈 때는 청바지만 입어.
  = Because jeans are more comfortable than skirts, when I travel, I wear only jeans.

This -아서/어서 form often connects two clauses where the first gives a reason for the second.

갈 때 means when (someone) goes.

Breakdown:

• 여행 가다 = to go traveling / to go on a trip
• 갈 = future/adnominal form of 가다
• 때 = time, the time when...
• 갈 때 = when going / when I go

Then 는 is added to 때:

• 갈 때는 = when it comes to times when I travel / when I travel

So 여행 갈 때는 means:

• when I travel
• when I go on trips

The 는 after 때 makes that time/situation the topic.

So:

• 여행 갈 때 = when traveling
• 여행 갈 때는 = as for when traveling / when it comes to traveling

This often adds a slight contrast, such as:

• maybe in everyday life I wear different things,
• but when I travel, I wear only jeans.

So 는 helps frame travel situations as a special case.

만 means only.

So:

• 청바지만 입어 = I wear only jeans
• 청바지를 입어 = I wear jeans

In this sentence, 만 emphasizes exclusivity: when traveling, the speaker wears jeans and nothing else in that category.

Also, when 만 is attached, it often replaces the object particle 를 in everyday speech:

• 청바지만 입어 is the natural form

You may also see:

• 청바지만을 입어
  but that is much less common and sounds more formal or emphatic.

입어 is the casual, non-polite present form of 입다.

This tells you the sentence is in:

• casual speech
• often used with friends, diaries, inner thoughts, or informal writing

It can also express a habitual action, not just something happening right now.

So here:

• 청바지만 입어 = I wear only jeans / I only wear jeans

A polite version would be:

• 청바지만 입어요.

It most naturally sounds habitual.

Because of 여행 갈 때는:

• when I travel
• on trips
• whenever I go traveling

So 청바지만 입어 here means something like:

• I only wear jeans when I travel
• When I go on trips, I stick to jeans

It is not mainly about one specific trip unless context makes it specific.

Korean often omits subjects when they are understood from context.

So even though English needs I in a natural translation, Korean usually does not say it unless it is needed for emphasis or clarity.

This sentence naturally implies:

• I wear only jeans when I travel

If you wanted to include it, you could say:

• 나는 치마보다 청바지가 더 편해서 여행 갈 때는 청바지만 입어.

But in many situations, 나는 is unnecessary.

청바지 here works as a general noun, like jeans in English.

Korean often does not mark plural when it is unnecessary. The meaning is understood from context.

So:

• 청바지만 입어 = I wear only jeans

You do not need 들 here. In fact, 청바지들 would sound unnatural in this sentence unless you were specifically talking about multiple pairs as separate items.

The sentence is:

• 치마보다 청바지가 더 편해서 여행 갈 때는 청바지만 입어.

A helpful breakdown is:

1. 치마보다 = than skirts
2. 청바지가 더 편해서 = because jeans are more comfortable
3. 여행 갈 때는 = when I travel
4. 청바지만 입어 = I wear only jeans

So the overall structure is:

• Because B is more adjective than A, when X happens, I only do Y.

More specifically:

• A보다 B가 더 adjective-아서/어서, X 때는 Y만 verb.

Yes. A natural polite version is:

• 치마보다 청바지가 더 편해서 여행 갈 때는 청바지만 입어요.

Only the final verb changes:

• 입어 → 입어요

Everything else can stay the same.

If you wanted a slightly more formal style, you could also say:

• 치마보다 청바지가 더 편해서 여행 갈 때는 청바지만 입습니다.

But 입어요 is the most common polite conversational version.