La dependenta m'ha dit que demà arribarà el vestit vermell en una talla més gran.

La dependenta means the shop assistant / saleswoman.

• dependenta is the feminine form.
• The masculine form is dependent.
• The article la is also feminine, so it matches dependenta.

So the sentence tells us the speaker is talking about a female shop assistant.

m' is a shortened form of em, which means to me.

So:

• em ha dit = has told me
• before a vowel, em usually contracts to m'
• therefore em ha dit becomes m'ha dit

This is very common in Catalan with object pronouns.

ha dit is the present perfect:

• ha = has (from haver)
• dit = said / told (past participle of dir)

So m'ha dit literally means has told me, although in natural English it may simply be translated as told me.

Catalan often uses this tense for something that happened recently or is still relevant now.

Here que means that and introduces the clause reporting what was said.

So the structure is:

• m'ha dit = she told me
• que... = that...

In Catalan, que is very commonly used after verbs like dir when you report speech or information.

demà means tomorrow.

In this sentence it comes before the verb:

• que demà arribarà...

This is a natural position in Catalan. It highlights the time reference early in the clause.

Catalan word order is flexible, so you could also hear:

• que el vestit vermell arribarà demà

Both are grammatical, but the original version sounds very natural.

arribarà is the simple future of arribar for he/she/it.

• arribar = to arrive
• arribarà = will arrive

The subject is el vestit vermell, so the meaning is the red dress will arrive.

Yes, el vestit vermell is the subject.

Catalan often allows the subject to come after the verb, especially with verbs like arribar, venir, sortir, and similar verbs of movement or appearance.

So:

• que demà arribarà el vestit vermell
• literally: that tomorrow will arrive the red dress

This sounds normal in Catalan, even though English usually prefers the red dress will arrive tomorrow.

In Catalan, adjectives usually come after the noun.

So:

• vestit vermell = red dress

This is especially normal with color adjectives like vermell.

Putting the adjective before the noun is much less common and usually gives a special stylistic or expressive effect.

Yes. Catalan adjectives agree in gender and number with the noun they describe.

Here:

• vestit is masculine singular
• so the adjective is vermell (masculine singular)

Compare:

• el vestit vermell = masculine singular
• la faldilla vermella = feminine singular
• els vestits vermells = masculine plural
• les faldilles vermelles = feminine plural

Here en means something like in or in the form of.

So en una talla més gran means:

• in a larger size
• in one size bigger

With clothes, talla means size, so the phrase is talking about the size in which the dress will arrive.

més gran is the normal way to say bigger / larger in this context.

• gran = big / large
• més gran = bigger / larger

For clothing sizes, this is a very natural choice.

A word like major usually does not mean a physically larger clothing size. It is used more for ideas like older, greater, or more important, depending on context.

Because una talla més gran means a larger size or one size bigger, not the largest size.

Compare:

• una talla més gran = a bigger size
• la talla més gran = the biggest size

So the sentence is saying the dress will arrive in a bigger size, not necessarily in the biggest available size.

The accents show where the stress falls.

• demà is stressed on the last syllable
• arribarà is also stressed on the last syllable

This matters because stress can change meaning or distinguish forms. In Catalan, written accents are very important for pronunciation and sometimes for grammar too.