Zhèjiàn yīfu de chǐmǎ yǒudiǎnr xiǎo, wǒ chuān de shíhou juéde bú tài héshēn.

件 is a measure word / classifier for many individual clothing items.

In Mandarin, when you say this / that / one with a noun, you usually need a classifier:

• 这件衣服 = this piece/item of clothing
• 那件外套 = that coat
• 一件衬衫 = one shirt

So 这件衣服 is more natural than just 这衣服 when you mean this particular garment.

Also, 衣服 can sometimes mean clothes in a general sense, but with 件, it clearly refers to one item of clothing.

Here, 的 links 衣服 and 尺码 and shows a relationship like of or ’s in English.

• 衣服的尺码 = the clothing item’s size
• literally: the size of the clothes / garment

A very common pattern is:

X 的 Y = Y of X / X’s Y

Examples:

• 我的衣服 = my clothes
• 这家店的价格 = this store’s prices
• 衣服的颜色 = the color of the clothes

So in this sentence, 衣服的尺码 means the size of this item of clothing.

尺码 is specifically used for clothing size, shoe size, and similar sizing systems.

• 尺码 = size label / clothing size / numerical or standardized size
• 大小 = size in a more general sense

So:

• 这件衣服的尺码有点儿小 sounds natural for clothes
• 这件衣服的大小有点儿小 is less natural here

Use 尺码 when talking about whether clothes or shoes fit properly.

有点儿 + adjective means a little bit / somewhat ..., often with a slightly negative tone.

So:

• 有点儿小 = a little small / a bit too small

This does not mean the clothing is extremely small. It means the speaker feels the size is slightly on the small side.

Common examples:

• 有点儿贵 = a little expensive
• 有点儿累 = a little tired
• 有点儿难 = a bit difficult

A useful nuance: 有点儿 often suggests that the speaker is not fully satisfied.

In Standard Mandarin, 有点儿 is often pronounced yǒudiǎnr, with 儿化 (the -r ending).

So you may hear:

• 有点儿 → yǒudiǎnr

In many speakers’ everyday Mandarin, especially outside northern varieties, people may say 有点 without a strong -r sound, and that is still widely understood.

So:

• 有点儿 = standard and common
• 有点 = also common in many contexts

If you are learning Standard Mandarin pronunciation, it is good to recognize and understand 有点儿.

This is because of tone sandhi.

Normally, 不 is pronounced bù. But when it comes before a fourth-tone syllable, it changes to bú.

Since 太 is fourth tone (tài), we get:

• 不太 → pronounced bú tài

More examples:

• 不是 → bú shì
• 不对 → bú duì
• 不要 → bú yào

It is still written 不, but the pronunciation changes.

V + 的时候 is a very common pattern meaning when doing V.

So:

• 穿的时候 = when wearing it / when I wear it / when I put it on

In the sentence:

• 我穿的时候觉得不太合身
• When I wear it, I feel it doesn’t fit very well

The pattern is:

• 吃的时候 = when eating
• 看书的时候 = when reading
• 上班的时候 = when working / while at work

Here, 的 helps connect the action 穿 with the time word 时候.

The object is understood from context: it is 这件衣服.

Chinese often omits repeated information when it is already obvious.

So:

• 这件衣服的尺码有点儿小，我穿的时候觉得不太合身。

really means something like:

• 这件衣服的尺码有点儿小，我穿这件衣服的时候觉得不太合身。

But repeating 这件衣服 would sound less natural and more repetitive.

This kind of omission is very common in Mandarin.

觉得 means to feel, to think, or to find based on personal impression.

In this sentence:

• 我穿的时候觉得不太合身
• When I wear it, I feel it doesn’t fit very well

It makes the statement sound subjective and personal.

Compare:

• 我穿的时候觉得不太合身 = I feel it’s not very fitting when I wear it
• 我穿的时候不太合身 = when I wear it, it’s not very fitting

Both can work, but 觉得 emphasizes my personal judgment / experience.

合身 specifically means to fit the body well, especially for clothes.

So:

• 这件衣服很合身 = this item of clothing fits well

It is more specific than 合适.

• 合身 = fits your body properly
• 合适 = suitable / appropriate / a good match in a broader sense

Examples:

• 这件衬衫很合身。 = This shirt fits well.
• 这件衬衫很合适。 = This shirt is suitable / appropriate.
  (This could refer to style, occasion, price, color, etc., not only body fit.)

So in this sentence, 合身 is the right word because the speaker is talking about how the clothing fits when worn.

不太 + adjective softens the statement.

• 不太合身 = not very fitting / not quite fitting
• 不合身 = doesn’t fit
• 很不合身 = really doesn’t fit

Because the earlier part says 有点儿小 (a bit small), the speaker is being relatively mild. The problem is noticeable, but not extremely serious.

So 不太合身 sounds natural and polite, especially in everyday conversation.

They are related, but not identical.

• 尺码有点儿小 = the size is a bit small
• 穿的时候觉得不太合身 = when I wear it, I feel it doesn’t fit very well

So the sentence gives both:

1. the cause: the size is slightly small
2. the result/experience: when I wear it, it doesn’t feel like a good fit

This is very natural in Chinese, just as in English you might say:

• The size is a little small, so when I wear it, it doesn’t fit quite right.

The sentence has two main parts separated by a comma:

这件衣服的尺码有点儿小，
我穿的时候觉得不太合身。

You can think of it like this:

1. Topic / situation:
   这件衣服的尺码有点儿小
   = The size of this item of clothing is a bit small.

2. Personal reaction / experience:
   我穿的时候觉得不太合身
   = When I wear it, I feel it doesn’t fit very well.

A more literal breakdown is:

• 这件衣服 = this item of clothing
• 的尺码 = its size
• 有点儿小 = is a bit small
• 我穿的时候 = when I wear it
• 觉得 = feel / think
• 不太合身 = not very fitting

So the sentence flows very naturally as:

This item of clothing is a bit small in size; when I wear it, I feel it doesn’t fit very well.