La vetrina del negozio è piena di vestiti eleganti.

Because vetrina is a feminine singular noun in Italian, so it takes the feminine singular definite article la.

• la vetrina = the shop window / display window
• masculine singular would use il instead

A good habit in Italian is to learn nouns together with their article:

• la vetrina
• il negozio
• il vestito

This helps you remember gender more easily.

In this sentence, vetrina means the shop window or display window of a store—the glass-front area where items are shown to customers.

So la vetrina del negozio is:

• the shop window
• or more literally, the window/display of the store

Depending on context, vetrina can also mean a display case or even a showcase, but here shop window is the natural meaning.

Del is a contraction of di + il.

• di = of
• il negozio = the shop
• di + il = del

So:

• la vetrina del negozio = the shop’s window / the window of the shop

Italian often combines di with a definite article:

• di + il = del
• di + lo = dello
• di + la = della
• di + i = dei
• di + gli = degli
• di + le = delle

So del negozio is just the normal Italian way to say of the shop.

Because piena agrees with vetrina, and vetrina is feminine singular.

The adjective pieno/piena means full, and Italian adjectives usually agree in gender and number with the noun they describe.

Here:

• la vetrina = feminine singular
• so the adjective must be piena

Compare:

• Il negozio è pieno. = The shop is full.
• La vetrina è piena. = The shop window is full.
• Le vetrine sono piene. = The shop windows are full.

Because the normal Italian pattern is:

• essere pieno di + noun = to be full of + noun

So:

• è piena di vestiti = it is full of clothes

This is a very common structure:

• La stanza è piena di gente. = The room is full of people.
• Il bicchiere è pieno d’acqua. = The glass is full of water.
• Le strade sono piene di macchine. = The streets are full of cars.

So piena di is something worth learning as a set phrase.

Vestiti is the plural of vestito.

Depending on context, vestito can mean:

• dress/suit/outfit
• or more broadly article of clothing

In this sentence, vestiti is best understood as clothes or garments, because a shop window can be full of displayed clothing in general.

So:

• vestiti eleganti = elegant clothes / smart clothes

If the speaker wanted to be more specific, they might use words like:

• abiti eleganti = elegant clothes / formalwear
• vestiti da donna = women’s dresses/clothes, depending on context

Because here the noun is being used in a general, indefinite way.

• piena di vestiti eleganti = full of elegant clothes

Italian often leaves out the article after expressions like pieno di when talking about things in a general sense.

Compare:

• una scatola piena di libri = a box full of books
• un armadio pieno di scarpe = a wardrobe full of shoes

If you added an article, the meaning would become more specific:

• piena dei vestiti eleganti would suggest full of the elegant clothes—a particular known set of clothes

That is not the natural meaning here.

Because eleganti describes vestiti, which is plural.

Italian adjectives usually agree with the noun they modify:

• vestito elegante = elegant piece of clothing / elegant dress
• vestiti eleganti = elegant clothes

The adjective elegante has the same form in masculine and feminine singular, but in the plural it becomes eleganti:

• singular: elegante
• plural: eleganti

Examples:

• un cappotto elegante
• una giacca elegante
• cappotti eleganti
• giacche eleganti

In Italian, adjectives often come after the noun, especially when they describe a quality in a straightforward way.

So:

• vestiti eleganti = elegant clothes

This is the most normal order here.

Some adjectives can come before the noun, but that often changes the tone or emphasis. With eleganti, the post-noun position is the standard and natural one.

Compare:

• una bella vetrina = a beautiful shop window
• vestiti eleganti = elegant clothes

So for this sentence, vestiti eleganti is exactly what you would expect.

No—con is not the natural choice here.

With pieno, Italian normally uses di:

• piena di vestiti eleganti = correct
• piena con vestiti eleganti = not natural / incorrect in standard usage

Think of it as a fixed pattern:

• pieno di qualcosa = full of something

So it is best to memorize:

• essere pieno di...

È is the third-person singular form of the verb essere (to be).

So:

• La vetrina ... è piena = The shop window ... is full

This form is used with singular subjects:

• il negozio è
• la vetrina è

If the subject were plural, you would use sono:

• Le vetrine sono piene di vestiti eleganti.

The accent distinguishes è (is) from e (and).

• è = is
• e = and

This is very important in writing.

Examples:

• La vetrina è piena. = The window is full.
• La vetrina e il negozio... = The window and the shop...

So the accent is not optional—it changes the word entirely.

Yes, that is a very close literal translation.

Word by word:

• La vetrina = the display window / shop window
• del negozio = of the shop
• è = is
• piena di = full of
• vestiti eleganti = elegant clothes

A more natural English version might be:

• The shop window is full of elegant clothes.
• The store window is full of elegant clothing.

So the literal structure matches English quite well in this sentence.

If you wanted to say The shop windows are full of elegant clothes, you would make the subject, verb, and adjective plural:

• Le vetrine del negozio sono piene di vestiti eleganti.

Changes:

• La vetrina → Le vetrine
• è → sono
• piena → piene

Notice that vestiti eleganti stays plural, just as it already is in the original sentence.

This is a good example of how Italian agreement works across the sentence.