Извините, у Вас есть такая блузка, но из другой ткани?

In Russian, possession is usually expressed with the pattern у + person + есть, literally something like at you there is.

So:

• у Вас есть = you have (formal/polite)
• у тебя есть = you have (informal)

Although иметь does mean to have, it is much less commonly used in everyday speech for ordinary possession. Вы имеете такую блузку? sounds unnatural in a normal shop conversation.

So У Вас есть такая блузка...? is the natural Russian way to ask Do you have a blouse like this...?

Capitalizing Вас is a polite writing convention when addressing one person formally, similar to extra politeness in a letter, message, or customer interaction.

So:

• у Вас = polite/formal you
• у вас = also correct, and very common in ordinary writing

The capital letter does not change the grammar or meaning. It just adds politeness or respect.

Because такая блузка is the thing that exists / is available in the shop, so it stays in the nominative case.

In the structure у Вас есть X, the thing possessed is normally in the nominative:

• У Вас есть блузка.
• У Вас есть такая блузка?

English learners often expect an object case here because English says Do you have..., but Russian does not build this idea the same way. Grammatically, блузка is not treated like a direct object after a normal transitive verb here.

So:

• такая блузка = nominative, correct
• такую блузку would be wrong in this sentence

Такая means such a, like this, or of this kind.

In this shop context, такая блузка usually means:

• a blouse like this one
• the same style/model/type
• something similar in appearance

It does not necessarily mean the exact same physical blouse.

That is why такая is very natural here: the speaker is probably showing or referring to one blouse and asking whether there is one of the same kind, but made from a different fabric.

Because the preposition из requires the genitive case.

Here:

• ткань = fabric, cloth
• genitive singular = ткани
• другой agrees with ткани in gender, number, and case

So:

• из ткани = from fabric
• из другой ткани = from a different fabric

This is why it is not из другая ткань or из другую ткань. After из, you need the genitive.

Yes, но literally means but, and it works naturally here.

The sentence is basically:

• Do you have a blouse like this, but made of a different fabric?

In English, we might also say:

• ...only in a different fabric?
• ...but in another fabric?
• ...except made from different material?

Russian often uses но in this kind of practical comparison. It does not sound strange.

Because но is a coordinating conjunction, and in Russian it normally takes a comma before it.

So the comma in:

• ...такая блузка, но из другой ткани?

is standard punctuation.

Even though the second part is short, the comma is still expected before но.

Извините means Excuse me or Sorry and is a polite way to begin a question, especially when speaking to a shop assistant or stranger.

It is not grammatically necessary, but it makes the sentence more natural and polite.

So:

• Извините, у Вас есть...? = very natural in a store
• У Вас есть...? = still correct, just a little more direct

You could sometimes hear а in similar contrasts, but но is better here.

Compare the feeling:

• но = but
• а = and/but, often showing contrast or comparison

In this sentence, the speaker wants the same kind of blouse, but with one important difference: the fabric. That strong contrast makes но the most natural choice.

So такая блузка, но из другой ткани sounds better than такая блузка, а из другой ткани.

Yes, it is natural and idiomatic.

Russian often describes clothing materials with из:

• рубашка из хлопка = a shirt made of cotton
• платье из шёлка = a dress made of silk
• блузка из другой ткани = a blouse made of a different fabric

You might also hear more expanded versions, such as:

• но из другой материи
• но из другого материала

But из другой ткани is perfectly normal, especially when talking specifically about fabric.

The given word order is natural and polite for a shop question:

• Извините, у Вас есть такая блузка, но из другой ткани?

Russian word order is flexible, so other versions are possible, for example:

• Извините, у Вас есть такая блузка из другой ткани?
• Извините, такая блузка, но из другой ткани, у Вас есть?

But the original version sounds very conversational and clear: first identify the item, then add the contrasting detail.

So for a learner, the original sentence is a good model to use.