A minha irmã saiu do provador e disse que a camisa da montra era mais bonita.

In European Portuguese, it is very common to use the definite article before a possessive: a minha irmã, o meu irmão, a nossa casa, etc.

So a minha irmã is the most natural European Portuguese form here.

Saying minha irmã without the article is much less common in Portugal and can sound more marked or less natural in ordinary speech.

Saiu is the 3rd person singular of the verb sair (to leave, to go out, to come out) in the pretérito perfeito simples.

Here it means she came out / left.

So:

• eu saí = I left / I came out
• ela saiu = she left / she came out

In this sentence, saiu do provador means she came out of the fitting room.

Do is a contraction of de + o.

• de = of / from
• o = the
• de + o = do

So:

• do provador = from the fitting room

This kind of contraction is extremely common in Portuguese:

• de + a = da
• em + o = no
• em + a = na

Provador is the place in a shop where you try clothes on. In English, that would usually be:

• fitting room
• changing room

So saiu do provador means came out of the fitting room/changing room.

In European Portuguese, montra means the shop window or display window where clothes or other products are shown.

So a camisa da montra means the shirt in the shop window or the shirt from the display.

A learner may notice that in Brazilian Portuguese, vitrine is more common for this idea, while montra is the usual European Portuguese word.

Da is a contraction of de + a.

• de = of / from
• a = the
• de + a = da

So a camisa da montra literally looks like the shirt of/from the shop window, but in natural English it means the shirt in the shop window or the shirt from the display.

Portuguese often uses de in places where English might prefer in, from, or a more flexible noun relationship.

After verbs like dizer (to say), Portuguese often uses que to introduce what was said.

So:

• disse que... = said that...

This works very much like English:

• She said that the shirt...

In everyday English, that is often omitted, but in Portuguese que is normally kept.

Because the sentence is reporting what she said from a past point of view.

The main verb is in the past:

• disse = she said

Then the following clause is also presented from that past perspective:

• era mais bonita = was prettier

This is very natural in Portuguese reported speech.

Compare:

• A camisa é mais bonita. = The shirt is prettier.
• Ela disse que a camisa era mais bonita. = She said the shirt was prettier.

Using é here is not impossible in every context, but era is the normal and expected choice when reporting the statement as part of a past narrative.

Because bonita agrees with camisa, which is a feminine singular noun.

• a camisa = feminine singular
• bonita = feminine singular adjective

Portuguese adjectives usually agree in gender and number with the noun they describe:

• o vestido bonito = the pretty dress
• a camisa bonita = the pretty shirt
• as camisas bonitas = the pretty shirts

The same is true in mais bonita.

It can mean either, depending on how naturally you want to translate it.

• mais bonita literally = more beautiful
• in natural English, often = prettier

So era mais bonita can be translated as:

• was prettier
• was more beautiful

Both are correct.

Usually camisa means shirt, but depending on context it can sometimes be translated as blouse if it is a women’s garment.

So in this sentence, a camisa da montra could be:

• the shirt in the shop window
• possibly the blouse in the shop window, depending on the item

The Portuguese word itself does not force the English choice in every context.

Yes. The ã in irmã is nasal, which is something many English speakers notice.

So irmã is not pronounced like a simple a sound. The ending is nasal, roughly like -mã, but without pronouncing a full final n or m sound the way English would.

This nasal vowel is an important feature of Portuguese pronunciation.

The given word order is completely natural:

A minha irmã saiu do provador e disse que a camisa da montra era mais bonita.

Portuguese does allow some flexibility, but this version is the most straightforward and neutral.

For example, you could move things around for emphasis, but in normal speech and writing this order is exactly what a learner should aim for. It follows a very common pattern:

• subject: A minha irmã
• verb: saiu
• complement: do provador
• second verb: disse
• reported clause: que a camisa da montra era mais bonita

Yes, mais bonita normally implies a comparison, even if the second term is not stated.

It means prettier / more beautiful, but Portuguese often leaves the comparison unstated when it is obvious from context.

For example, she may mean:

• prettier than the one she tried on
• prettier than another shirt
• prettier than the others

So the sentence itself does not specify the second item being compared, but native speakers would understand it from the situation.