La camisa blanca combina bien con los pantalones marrones.

Because camisa is a feminine noun in Spanish, so both the article and the adjective must agree with it:

• la = feminine singular the
• blanca = feminine singular form of blanco

So:

• la camisa blanca = the white shirt

If the noun were masculine, you would use masculine forms, for example:

• el pantalón blanco

In Spanish, adjectives often come after the noun, especially when they describe things like:

• colour
• size
• shape
• nationality

So camisa blanca is the normal word order for white shirt.

Putting the adjective before the noun is sometimes possible, but it usually sounds literary, emphatic, or changes the nuance. With colours, the usual order is definitely:

• camisa blanca
• pantalones marrones

Because the subject of the sentence is la camisa blanca, which is singular.

So the verb must also be singular:

• La camisa blanca combina... = The white shirt goes/matches...

The phrase con los pantalones marrones is not the subject. It just tells you what the shirt goes with.

Compare:

• La camisa blanca combina... → singular subject
• Las camisas blancas combinan... → plural subject

Here, combinar con means to go with or to match.

The structure is:

• combinar con + noun
• combinar bien con + noun = to go well with + noun

So:

• La camisa blanca combina bien con los pantalones marrones
  = The white shirt goes well with the brown trousers

This is a very common way to talk about clothes, colours, and style.

Because bien is an adverb, and it modifies the verb combina.

• bien = well
• bueno / buena / buenos / buenas = good

In this sentence, we are saying how the shirt matches, so Spanish uses the adverb:

• combina bien = it matches well

Not:

• combina bueno ❌

Because pantalones is very commonly used in the plural in Spanish, just like trousers in British English.

So:

• los pantalones marrones = the brown trousers / pants

Even though it refers to one pair, Spanish often treats it as plural in this kind of sentence.

That is why you also get a plural adjective:

• marrones

Because marrón has to agree in number with pantalones, which is plural.

So:

• el pantalón marrón = singular
• los pantalones marrones = plural

Notice the pattern:

• singular: marrón
• plural: marrones

This is just adjective agreement in Spanish.

Yes. In Spanish, adjectives usually agree with the nouns they describe in gender and number.

In this sentence:

• camisa is feminine singular → blanca
• pantalones is masculine plural → marrones

So the agreement is:

• camisa blanca
• pantalones marrones

This is one of the most important grammar rules in Spanish.

Spanish uses definite articles very naturally with clothing, especially when talking about specific items or a particular outfit.

So:

• la camisa blanca
• los pantalones marrones

sounds normal and complete.

In English, we sometimes drop articles more easily, but in Spanish they are often required. Leaving them out here would sound unnatural in a normal sentence.

Yes. That is also natural.

• combina bien con = goes well with / matches well with
• va bien con = goes well with

Both are correct, but combina bien con sounds a little more directly about matching, while va bien con is a very common everyday alternative.

It can be used more broadly.

Although it is very common with clothes, colours, and outfits, combinar con can also be used for other things that match well together, such as:

• furniture
• colours in a room
• accessories
• design elements

For example:

• El sofá combina con las cortinas.
• Ese color combina bien con el azul.

So it is a useful verb beyond just clothing.