zhè shì shēnsè yīfu.

Because 这 is acting as a pronoun, meaning this.

The structure is:

• 这 = this
• 是 = is
• 深色衣服 = dark-colored clothing / dark-colored clothes

So the sentence is literally This is dark-colored clothing.

You use 这个 when 这 directly modifies a noun and needs a measure word:

• 这个人 = this person
• 这件衣服 = this piece of clothing

But in 这是深色衣服, 这 stands alone, so no measure word is needed.

For the same reason: 这 is not directly attached to a noun here.

Compare these two patterns:

• 这是衣服。 = This is clothing.
• 这件衣服。 = this item of clothing

In the second pattern, 这 modifies 衣服, so you need a measure word such as 件. In the sentence you gave, 这 is the whole subject by itself, so no measure word appears.

是 is often like English to be, but not in every situation.

Here, 是 links 这 with a noun phrase:

• 这 → subject
• 是 → links subject and noun phrase
• 深色衣服 → noun phrase

So 是 works naturally here.

However, Chinese does not use 是 before adjectives the same way English does. For example, English says This shirt is dark, but Chinese more naturally says:

• 这件衣服是深色的。
• or sometimes 这件衣服很深色 is less standard and not the usual beginner pattern

So 是 is fine before a noun phrase like 深色衣服, but with plain adjectives Chinese often uses different patterns.

Because 深色 can directly modify 衣服 as a compound-style modifier.

So:

• 深色衣服 = dark-colored clothing / dark clothes

This is normal Chinese.

You can also say:

• 深色的衣服

That version is also correct and may sound a little more explicitly descriptive. In many cases, both are possible:

• 深色衣服
• 深色的衣服

The version without 的 is compact and very common, especially in everyday labels, descriptions, and categories.

深色 means dark in color or dark-colored.

It does not mean only black. It refers more generally to colors that are deep or dark, such as:

• dark blue
• dark gray
• dark brown
• black-like dark shades

Its common opposite is:

• 浅色 = light-colored

So 深色衣服 means clothes in darker colors, not necessarily black clothes.

They are related, but not the same.

• 深色 = dark-colored, a broad category
• 黑色 = black, one specific color

So:

• 深色衣服 = dark-colored clothes
• 黑色衣服 = black clothes

If something is black, it is usually also 深色, but not all 深色 clothes are black.

Usually 衣服 is a general word for clothes or clothing.

Chinese nouns usually do not change form for singular and plural the way English nouns do. So 衣服 can refer to clothing in a general sense, and context tells you more.

If you want to clearly refer to one item, Chinese often uses a measure word:

• 一件衣服 = one piece/item of clothing
• 这件衣服 = this item of clothing

So in your sentence, 衣服 sounds more general than a single clearly counted item.

Yes, but it depends on the situation.

这是深色衣服 is natural when you are identifying a category, type, or group, for example:

• 这是深色衣服，那是浅色衣服。
  • This is dark-colored clothing; that is light-colored clothing.

But if you are talking about one specific garment, Chinese speakers often prefer:

• 这件衣服是深色的。

That sounds more like This piece of clothing is dark-colored.

So the sentence you gave is understandable and correct, but for a single item, 这件衣服是深色的 is often more natural.

That is actually a very common alternative, and in many real-life situations it may sound more natural.

The difference is mainly structural:

• 这是深色衣服。

  • This is dark-colored clothing.
  • More like identifying what something is.

• 这件衣服是深色的。

  • This item of clothing is dark-colored.
  • More like describing the color property of a specific item.

So both are useful, but they focus on the idea a little differently.

In standard Mandarin, 衣服 is commonly pronounced yīfu, with the second syllable in a neutral tone.

So you will often hear:

• yīfu

rather than a full second tone on 服.

This is very common in everyday Mandarin: many two-syllable words have a neutral second syllable in actual speech.

No. Chinese does not use articles like English a, an, and the.

So 这是深色衣服 does not need any separate word for a or the. The exact English translation depends on context:

• This is dark-colored clothing.
• This is a dark-colored garment.
• These are dark clothes. — if the situation makes that meaning clear

English forces you to choose articles and number more often; Chinese often leaves that to context.

The easiest way is to add 吗:

• 这是深色衣服吗？
  • Is this dark-colored clothing?

You can also use an A-not-A question, though that is less directly tied to this exact noun phrase pattern. For beginners, 吗 is the simplest and most common choice.

You can negate 是 with 不:

• 这不是深色衣服。
  • This is not dark-colored clothing.

If you are talking about one specific item and describing its color, a more natural negative might be:

• 这件衣服不是深色的。
  • This item of clothing is not dark-colored.

So the negative pattern depends a little on whether you are identifying something or describing it.