huyu ha atatakai kooto wo kimasu.

It is read:

ふゆ は あたたかい コート を きます。

Word by word:

• 冬（ふゆ） = winter
• は = topic marker, pronounced わ here
• 暖かい（あたたかい） = warm
• コート = coat
• を = object marker
• 着ます（きます） = wear / put on

は marks 冬 as the topic of the sentence.

So 冬は means something like:

• as for winter
• in winter
• when it comes to winter

It sets the scene or topic first, and then the rest of the sentence says something about that topic.

So the sentence has the feel of:

As for winter, (I/people) wear warm coats.

Both can be possible in different contexts, but they feel a little different.

• 冬は暖かいコートを着ます。
  This presents winter as the topic: As for winter, (I) wear warm coats.
• 冬に暖かいコートを着ます。
  This focuses more directly on the time: I wear warm coats in winter.

A simple way to think about it:

• は = topic / contrast / general statement
• に = specific time marker

With seasons, は is very common when talking about habits or seasonal behavior.

In Japanese, adjectives usually come before the noun they describe, just like in English.

So:

• 暖かいコート = warm coat

This works the same way as:

• 大きい家 = big house
• 新しい車 = new car

So 暖かい directly modifies コート.

暖かい is an い-adjective.

That means it ends in い in its plain form and can directly modify a noun:

• 暖かいコート = a warm coat

You do not need な here.
That would be for many な-adjectives, not い-adjectives.

So:

• correct: 暖かいコート
• not correct: 暖かなコート is actually a separate valid literary/formal form, but for learners the standard pattern here is 暖かいコート

を marks the direct object of the verb.

Here, the verb is 着ます (to wear / put on), and the thing being worn is コート.

So:

• コートを着ます = wear a coat

The pattern is:

[thing you wear] + を + 着ます

Examples:

• シャツを着ます = wear a shirt
• 上着を着ます = wear a jacket

着ます can mean either put on or wear, depending on context.

In a sentence like this one, it often feels more like a general habit:

• In winter, I wear warm coats.

If you were describing the action at a specific moment, it could be:

• I’m putting on a warm coat.

So the exact English translation depends on context, but wear is the most natural choice here.

Also, 着る / 着ます is used for clothes worn on the upper body or overall body, such as:

• shirts
• jackets
• coats
• dresses

Japanese often leaves out the subject when it is understood from context.

So this sentence does not explicitly say:

• I wear
• you wear
• people wear

It simply says:

As for winter, wear warm coats.

In natural English, we usually fill in the subject based on context. Common interpretations are:

• I wear warm coats in winter.
• People wear warm coats in winter.

Japanese often relies on context instead of stating the subject every time.

By itself, コート does not clearly mark singular or plural.

So 暖かいコートを着ます could mean:

• wear a warm coat
• wear warm coats

Japanese nouns usually do not change form for singular vs. plural the way English nouns do.

The same is true for articles:

• no a
• no the

Those details are usually understood from context.

コート is a loanword, borrowed from a foreign language, so it is written in katakana.

Many modern clothing words in Japanese are loanwords, for example:

• シャツ = shirt
• セーター = sweater
• コート = coat

Katakana is commonly used for:

• foreign loanwords
• foreign names
• some sound effects
• emphasis in some cases

The sentence follows normal Japanese word order, which is often:

topic / time + object + verb

So here:

• 冬は = topic/time setting
• 暖かいコートを = object
• 着ます = verb

The verb usually comes at the end of the sentence in Japanese.

That is one of the biggest differences from English.

Yes. 着ます is the polite non-past form.

The dictionary form is:

• 着る = to wear

Polite form:

• 着ます

Casual/plain version of the full sentence:

• 冬は暖かいコートを着る。

So the sentence you were given is appropriate for normal polite speech.

It most naturally describes a habit or general truth.

So it means something like:

• In winter, I wear warm coats.
• People wear warm coats in winter.

Because:

• 冬は sets a seasonal topic
• 着ます in the non-past can express habitual actions

Japanese non-past forms often cover both:

• present/future
• repeated or habitual actions

No. Japanese is normally written without spaces.

So the normal written sentence is:

冬は暖かいコートを着ます。

Spaces are often added in beginner materials to make it easier to see the parts of the sentence.

So both represent the same sentence, but the version without spaces is how Japanese is usually written.