لون القميص فاتح.

A natural Egyptian pronunciation is:

lōn il-ʔamīṣ fātiḥ

A rough English-friendly guide:

LOHN il-a-MEES FAA-teh

A few sound notes:

• ق in Egyptian Arabic is usually a glottal stop ʔ, not a hard q sound
• ح in فاتح is a stronger, breathier h
• ص in قميص is a heavy or emphatic s

So القميص in Egyptian is often said more like il-ʔamīṣ.

Here is the breakdown:

• لون = color
• القميص = the shirt
• فاتح = light-colored, pale, light

The first two words, لون القميص, go together as one unit:

• لون القميص = the color of the shirt / the shirt’s color

Then فاتح tells you what that color is like.

Because Arabic often expresses possession with a structure called iḍāfa.

So instead of saying something like:

• the shirt’s color

Arabic builds it as:

• لون القميص
• literally: color the-shirt

This is the normal Arabic way to say the color of the shirt or the shirt’s color.

In Arabic, present-tense sentences like this usually do not use a separate word for is/am/are.

So:

• لون القميص فاتح

already means:

• The shirt’s color is light

This is completely normal in both Egyptian Arabic and Standard Arabic.

If you wanted past tense, then you would use a verb, for example with كان.

Because لون القميص is an iḍāfa phrase.

In this structure:

• the first noun normally does not take ال
• the second noun can take ال
• the whole phrase becomes definite because the second noun is definite

So:

• لون قميص = a shirt’s color / the color of a shirt
• لون القميص = the color of the shirt

That is why لون appears without ال.

Because it matches the grammatical subject, which is لون القميص, headed by لون.

And لون is:

• masculine
• singular

So the predicate adjective is:

• فاتح

A useful comparison:

• لون التنورة فاتح = the skirt’s color is light
  Here فاتح still stays masculine, because لون is masculine.

But if you describe the skirt directly, then you would say:

• التنورة فاتحة = the skirt is light-colored

So the form depends on what the sentence is grammatically describing.

It works in Egyptian Arabic and also in Modern Standard Arabic.

What makes it sound Egyptian is mainly the pronunciation, especially:

• ال often pronounced il or el
• ق often pronounced as a glottal stop

So in Egyptian speech, القميص is commonly pronounced il-ʔamīṣ.

Yes. A very common Egyptian way is:

• القميص لونه فاتح

This literally means:

• the shirt, its color is light

That sounds very natural in everyday Egyptian Arabic.

You may also hear:

• القميص فاتح

if the context already makes it clear that you are talking about color.

So all of these can work, with slightly different levels of explicitness.

No. فاتح has more than one meaning depending on context.

With colors, it means:

• light
• pale
• light-colored

But in other contexts, it can mean:

• open
• opened

For example, with a door or a store, فاتح might mean open.

In this sentence, because the topic is color, the meaning is clearly light-colored.

A very common opposite is:

• غامق = dark

So you can compare:

• لون القميص فاتح = the shirt’s color is light
• لون القميص غامق = the shirt’s color is dark

This is a very useful pair for everyday descriptions of clothes and colors.

In Egyptian Arabic, the usual negative here is مش.

So:

• لون القميص مش فاتح

means:

• The shirt’s color isn’t light

You could also hear:

• القميص لونه مش فاتح

which is very natural in everyday Egyptian speech.