La falda azul combina bien con el jersey blanco.

Because Spanish nouns have grammatical gender.

• falda is a feminine noun, so it takes la
• jersey is a masculine noun in Spanish, so it takes el

This does not mean the objects themselves are feminine or masculine in a real-world sense; it is just a grammatical category.

A useful pattern is:

• la + feminine noun
• el + masculine noun

So:

• la falda
• el jersey

In Spanish, adjectives often come after the noun, especially when they describe a basic, distinguishing quality such as color, size, or type.

So:

• falda azul = blue skirt
• jersey blanco = white sweater

This is the most natural order here. English usually puts adjectives before the noun, but Spanish usually puts many descriptive adjectives after it.

Both adjectives must agree with the noun they describe, but not all adjectives change in the same way.

• blanco changes for gender and number:
  • blanco (masculine singular)
  • blanca (feminine singular)
  • blancos
  • blancas

So with jersey (masculine singular), you get blanco.

• azul does not change for gender in the singular:
  • azul for masculine singular
  • azul for feminine singular

So:

• el jersey azul
• la falda azul

It only changes in the plural:

• azules

Because the subject of the sentence is singular: La falda azul.

The verb combinar here means something like to go well with or to match. Since la falda azul is one thing, the verb must be singular:

• La falda azul combina... = The blue skirt goes/matches...

If the subject were plural, then you would use combinan:

• Las faldas azules combinan bien con el jersey blanco.

Combinar con means to go with, to match, or to look good with.

So:

• La falda azul combina con el jersey blanco = The blue skirt matches/goes with the white sweater
• combina bien con adds well, so it means goes well with

This phrase is very common for clothes, colors, furniture, decoration, and style.

Examples:

• Ese bolso combina con tus zapatos.
• El rojo combina bien con el negro.

Because the verb pattern is combinar con algo = to go with something / to match something.

So the structure is:

• X combina con Y

In this sentence:

• La falda azul = X
• combina bien con
• el jersey blanco = Y

You normally need con with this meaning.

Yes. That is completely correct.

The meaning is essentially the same. You are just changing which item is presented as the grammatical subject.

• La falda azul combina bien con el jersey blanco
• El jersey blanco combina bien con la falda azul

Both mean that the two items go well together.

In Spanish, articles such as el and la are often used more than in English. With clothing and everyday nouns, it is very normal to include them.

So:

• La falda azul combina bien con el jersey blanco sounds natural and complete.

Without the articles, the sentence sounds unnatural in standard Spanish in this context.

Spanish often prefers:

• el / la / los / las where English might sometimes omit the.

Yes. In Spain, jersey commonly means sweater or jumper.

This is important because an English speaker may think of jersey as a sports shirt, but in Spain Spanish, jersey usually means a knitted top like a sweater.

In other Spanish-speaking regions, you may hear other words, such as:

• suéter
• pulóver
• chompa or other regional terms

But in Spain, jersey is very common.

In Spain, jersey is usually pronounced approximately like:

• her-SEI

More precisely:

• the j sounds like a strong Spanish j, not like the English j in job
• the stress falls on the second syllable: jer-SEY

A rough English-friendly guide is:

• kher-SEI or her-SEI

It is not pronounced exactly like the English word jersey.

Yes. Very often.

You can use combinar for:

• clothes
• colors
• accessories
• decoration
• furniture
• styles

Examples:

• El azul combina bien con el blanco.
• Estas zapatillas combinan con la chaqueta.
• Los muebles negros combinan bien con la pared gris.

So this sentence uses a very common real-life pattern.

Yes. Va bien con is also very common and natural.

Compare:

• La falda azul combina bien con el jersey blanco.
• La falda azul va bien con el jersey blanco.

Both are correct.

A small difference:

• combina bien con sounds a little more specifically about matching
• va bien con can sound a little broader and more everyday, like goes well with

In many situations, they are interchangeable.

You would need to change articles, nouns, adjectives, and possibly the verb so they agree in number.

For example:

• Las faldas azules combinan bien con el jersey blanco.
  • la → las
  • falda → faldas
  • azul → azules
  • combina → combinan

Or:

• La falda azul combina bien con los jerseys blancos.
  • el → los
  • jersey → jerseys
  • blanco → blancos

This is a good example of how agreement works in Spanish.

Here, azul is an adjective because it describes falda.

• falda = noun
• azul = adjective

Likewise:

• jersey = noun
• blanco = adjective

Colors in Spanish can sometimes act as nouns in other contexts, but in this sentence both color words are adjectives.

Yes, it sounds natural and standard in Spain.

In particular:

• jersey is very typical in Spain
• combina bien con is a normal way to talk about clothing and color matching

So this is a very useful model sentence for everyday Spanish in Spain.