الملابس الرسمية جاهزة.

A natural pronunciation in MSA is:

al-malābis ar-rasmiyya jāhiza

A few notes:

• الملابس = al-malābis
• الرسمية is written with الـ, but because ر is a sun letter, the l sound of al- is absorbed, so it is pronounced ar-rasmiyya
• جاهزة = jāhiza

If you pause at the end, you normally do not pronounce the final case vowels.

الملابس is plural. It means clothes or clothing.

It comes from a root connected with wearing or لباس-related vocabulary. In actual usage, ملابس is a very common word for clothes.

Even though English clothes is also plural in form, Arabic handles agreement with this word a little differently because it is a non-human plural.

In Arabic, the verb to be is usually not stated in the present tense.

So:

• الملابس الرسمية جاهزة = The formal clothes are ready

There is no separate word for are here.

This is a very common Arabic pattern called a nominal sentence. In the present tense, Arabic often just puts:

• the subject
• then the predicate

If you wanted a past-tense meaning, then a form of كان could appear.

This is one of the most important grammar points in the sentence.

In MSA, non-human plurals are often treated grammatically as feminine singular when adjectives agree with them.

So although الملابس means clothes and is plural, the adjective after it appears in the feminine singular form:

• الرسمية = formal

This is normal Arabic agreement for non-human plurals.

So Arabic is not treating the meaning as singular; it is using a standard grammatical agreement pattern.

For the same reason: الملابس is a non-human plural, so the predicate adjective also appears in the feminine singular form.

That is why you get:

• الملابس الرسمية = the formal clothes
• جاهزة = ready

Both الرسمية and جاهزة are feminine singular to match the normal agreement pattern for non-human plurals.

Because the two adjectives are doing different jobs.

1. الرسمية

This is an adjective directly describing الملابس inside the noun phrase:

• الملابس الرسمية = the formal clothes

Since الملابس is definite because of الـ, the adjective describing it must also be definite:

• الملابس
• الرسمية

This is standard adjective agreement in Arabic: the adjective matches the noun in definiteness.

2. جاهزة

This is not part of the noun phrase. It is the predicate of the whole sentence:

• الملابس الرسمية = the subject
• جاهزة = the predicate, ready

Predicate adjectives in this kind of sentence are usually indefinite, so جاهزة does not take الـ.

It is a nominal sentence:

• الملابس الرسمية = the subject part
• جاهزة = the predicate part

More specifically:

Subject phrase

الملابس الرسمية

This is a noun plus its adjective:

• الملابس = the clothes
• الرسمية = formal

So together: the formal clothes

Predicate

جاهزة

This tells you the state of the subject:

• ready

So the whole sentence literally works like:

• The formal clothes — ready.

Which in natural English becomes:

• The formal clothes are ready.

A fully vocalized version would usually be:

الملابسُ الرسميةُ جاهزةٌ

Here is why:

• الملابسُ → nominative, because it is the subject
• الرسميةُ → nominative, because it is an adjective matching the subject
• جاهزةٌ → nominative, because it is the predicate of a nominal sentence

In everyday writing, these short vowels are usually omitted, so you normally see:

الملابس الرسمية جاهزة

Not always. The adjective رسمي can mean things like:

• official
• formal

The exact meaning depends on context.

With clothes, الملابس الرسمية naturally means:

• formal clothes
• formal wear

So here, formal is the best interpretation.

The normal, straightforward order here is:

الملابس الرسمية جاهزة

That is the most natural way to say The formal clothes are ready.

Arabic can sometimes change word order for emphasis, but for a learner, this standard order is the one to remember:

• subject first
• predicate second

Also, the adjective الرسمية must stay with الملابس, because it describes it directly. So الملابس الرسمية forms one unit.