على حسب البروفة، الترزي هيوسع الياقة.

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

In this sentence, على حسب البروفة means something like:

• depending on the fitting
• according to the fitting
• based on how the fitting goes

It is a very common expression in Egyptian Arabic.

Here, البروفة means the fitting or the try-on of the clothes.

Even though بروفة can also mean rehearsal in other contexts, the clothing context here makes fitting the natural meaning.

No, it is a loanword. In Egyptian Arabic, بروفة is borrowed from a European source and is very common in everyday speech.

So this is one of many normal colloquial words that are not originally Arabic but are fully natural in Egyptian Arabic.

الترزي means the tailor.

Yes, you may also hear الخياط for tailor, especially in more formal Arabic or outside Egyptian speech. But ترزي is very common and natural in Egyptian Arabic.

So:

• الترزي = the tailor
• الخياط = the tailor/seamster, often a bit more formal or standard

Because ت is a sun letter. In Arabic, when الـ comes before a sun letter, the l sound assimilates to the next consonant.

So:

• written: الترزي
• pronounced: et-tarzi / it-tarzi

The same thing happens in many other words, such as:

• الشمس → esh-shams
• النهار → en-nahār

هيوسع means he will widen, he will make wider, or in clothing context, he will let out.

It breaks down like this:

• هـ / هَـ = future marker, will
• يوسع = widens / makes wider

So هيوسع = he will widen

Because this is about clothing, a very natural English translation is often he’ll let out the collar.

The base verb is وسّع.

This verb means:

• to widen
• to enlarge
• to make something wider

So the forms are roughly:

• وسّع = he widened / made wider
• يوسّع = he widens / is widening
• هيوسّع = he will widen

In normal writing without vowels, you see it as هيوسع.

Because the subject is الترزي, which is masculine singular.

In Egyptian Arabic, the verb agrees with the subject:

• هو / a masculine singular noun → هيوسع
• هي / a feminine singular noun → هتوسع

So since the tailor is masculine, هيوسع is the correct form.

الياقة means the collar.

In clothing contexts, it can sometimes overlap a bit with neckline, depending on the garment and situation, but collar is the most direct meaning.

In Egyptian pronunciation, the ق in this word is often pronounced as a glottal stop. So it may sound roughly like:

• el-yāʔa

Because the sentence is talking about specific things:

• the fitting
• the tailor
• the collar

This makes the sentence sound like part of a known situation: a particular garment, a particular fitting session, and a particular tailor.

If you removed الـ, the meaning would become less specific and less natural in this context.

Yes. The sentence could also be said as:

الترزي هيوسع الياقة على حسب البروفة.

That would still be understandable and natural.

The version with على حسب البروفة at the beginning puts the condition or basis first:

• Depending on the fitting, the tailor will widen the collar.

So the fronted phrase helps frame the whole statement.

A helpful pronunciation guide is:

ʿala ḥasab el-brova, et-tarzi haywassaʿ el-yāʔa.

A few notes:

• على = ʿala
• حسب = ḥasab
• البروفة = el-brova
• الترزي = et-tarzi
• هيوسع = haywassaʿ
• الياقة = el-yāʔa

You may hear small pronunciation differences depending on the speaker.

It is clearly Egyptian Arabic in style.

The strongest clue is هيوسع, because هـ as a future marker is a colloquial Egyptian feature.

Also, words like بروفة and ترزي feel very natural in spoken Egyptian.

In Modern Standard Arabic, you would express this differently, for example by using:

• سيُوسِّع for he will widen
• الخياط for the tailor more often than الترزي

So this sentence is best understood as everyday Egyptian Arabic.