على حسب البطانة، الترزي هيختار الخيط.

It means depending on, according to, or based on.

In Egyptian Arabic, على حسب is a very common expression for saying that something changes depending on another factor.

So:

• على حسب البطانة = depending on the lining
• على حسب المقاس = depending on the size
• على حسب الجو = depending on the weather

It is less literal than English on top of or anything like that. Here it simply introduces the basis for the decision.

البطانة means the lining, especially the inner fabric layer inside a garment, jacket, coat, bag, and so on.

In this sentence, it refers to the lining material that helps determine what kind of thread should be used.

In Egyptian pronunciation, it is roughly el-biṭāna.

الترزي means the tailor in Egyptian Arabic.

It is a very common everyday Egyptian word, but it is not the most standard Modern Standard Arabic word. In MSA, you are more likely to see:

• الخياط = the tailor

So:

• Egyptian: الترزي
• MSA: الخياط

A learner should recognize الترزي as strongly colloquial and very useful in spoken Egyptian.

هيختار means he will choose.

It is built from:

• يختار = he chooses / he choose
• plus the Egyptian future marker هـ or حـ

So:

• يختار = he chooses
• هيختار = he will choose

You may also see this written as حيختار in informal spelling. Both represent Egyptian spoken usage.

This verb is related to اختار = to choose, which is also used in MSA.

Because Egyptian Arabic often likes subject + verb order, especially in everyday speech.

So الترزي هيختار الخيط is very natural in Egyptian:

• الترزي = the tailor
• هيختار = will choose
• الخيط = the thread

Also, the sentence starts with على حسب البطانة, which sets the context first. After that, putting the subject next sounds smooth and natural:

• على حسب البطانة، الترزي هيختار الخيط

In more formal Arabic, verb-first order is often more common, but in spoken Egyptian, subject-first order is extremely normal.

Because they are all definite in this sentence:

• البطانة = the lining
• الترزي = the tailor
• الخيط = the thread

Arabic often uses the definite article where English might still sound a bit more general.

Here, the meaning is not just any random tailor or any random thread. It is understood as:

• the lining of the garment in question
• the tailor dealing with it
• the thread that should be chosen for it

So the definiteness feels natural in Arabic.

Not necessarily one physical strand of thread.

In a sewing context, الخيط can refer to the thread to use or the type of thread. Arabic often uses the singular this way when speaking about a material or category.

So here it most likely means something like:

• the appropriate thread
• the thread choice
• the thread type

If you really wanted to emphasize multiple threads, you could use the plural الخيوط.

A rough pronunciation is:

ʿala ḥasab el-biṭāna, et-tarzi hayekhtār el-khēṭ.

A few useful notes:

• الترزي is pronounced et-tarzi, not el-tarzi, because ت is a sun letter, so the l sound of الـ assimilates.
• الخيط keeps the l sound: el-khēṭ, because خ is not a sun letter.
• خ sounds like the ch in Scottish loch or German Bach.
• ط is an emphatic t.

Yes, it has clear Egyptian features.

The most obvious ones are:

• الترزي for tailor
• هيختار for he will choose

A more formal or MSA-style version would be something like:

• بحسب البطانة، سيختار الخياط الخيط.

So the sentence is very understandable, but it is definitely phrased in an Egyptian spoken style.

Yes.

Some alternatives are:

• حسب البطانة = according to the lining
• بحسب البطانة = according to the lining, more formal
• على حسب نوع البطانة = depending on the type of lining

In everyday Egyptian, على حسب is one of the most common and natural choices, so the original sentence sounds very normal.