Anna indossa un vestito viola per la festa.

Indossa is the third-person singular present of indossare.

• indossare = to wear / to put on clothing
• Anna indossa = Anna wears / is wearing

It is a very common verb for clothes, shoes, glasses, and accessories.

Examples:

• Lui indossa una giacca.
• Lei indossa gli occhiali.

Compared with English, the Italian present tense can often mean either wears or is wearing, depending on context.

Italian often drops subject pronouns when they are not needed, because the verb ending already shows who the subject is.

Here:

• indossa already tells you it is he/she form
• Anna is explicitly named, so lei would be unnecessary

So:

• Anna indossa un vestito viola is the normal way
• Anna lei indossa... would sound wrong in standard Italian
• Lei indossa... is possible only if the subject is not otherwise named and the context makes it clear that lei means Anna

Because vestito is a masculine singular noun, so it takes the masculine indefinite article un.

• un = masculine singular
• una = feminine singular

So:

• un vestito
• una gonna

This can feel surprising to English speakers because the English word dress does not have grammatical gender. In Italian, noun gender is grammatical, not necessarily logical.

Not always. Vestito can have a few related meanings depending on context, such as:

• dress
• suit
• outfit

In this sentence, the context and the rest of the meaning make it clear what kind of clothing is meant. But as a vocabulary item, vestito is broader than just one English word in every situation.

In Italian, color adjectives usually come after the noun.

So:

• un vestito viola
• una maglia rossa
• scarpe nere

That is the normal word order. English often puts the color before the noun, but Italian usually places it after.

Viola is one of those color words that is usually invariable in modern Italian, meaning it often stays the same in masculine/feminine and singular/plural contexts.

So you can commonly see:

• un vestito viola
• una gonna viola
• due vestiti viola
• due gonne viola

This is different from adjectives like:

• rosso / rossa / rossi / rosse
• nero / nera / neri / nere

So viola is a useful adjective to remember as generally unchanged.

Yes, in many contexts portare can also mean to wear, especially in everyday speech.

So both can work:

• Anna indossa un vestito viola
• Anna porta un vestito viola

But there is a nuance:

• indossare is more specifically about wearing clothing/accessories
• portare is broader and can mean many things, including to carry, to bring, or to wear

If you want the clearest clothing-specific verb, indossare is excellent.

Per la festa means something like for the party or for the celebration. It shows purpose or occasion: the dress is being worn because of that event.

• per la festa = for the party, for the occasion

By contrast, alla festa means at the party and focuses more on location or event setting.

So the difference is roughly:

• indossa un vestito viola per la festa = she is wearing it for the party
• indossa un vestito viola alla festa = she is wearing it at the party

Sometimes both are possible, but they emphasize slightly different things.

Italian uses the definite article very often, including in phrases where English may or may not use one.

Here:

• la festa = the party / the celebration

After per, using the article is completely normal:

• per la cena
• per il matrimonio
• per la festa

You should learn these combinations as natural Italian patterns rather than trying to match English article use exactly.

It can mean either, depending on context.

Italian present tense often covers both:

• habitual meaning: wears
• current action/state: is wearing

So Anna indossa un vestito viola could mean:

• she generally wears that dress for the event, or
• right now she is wearing a purple dress

Usually the surrounding context tells you which reading is intended.

Yes. If you want to emphasize the action of putting on the dress, Italian often uses mettersi.

Compare:

• Anna indossa un vestito viola = Anna wears / is wearing a purple dress
• Anna si mette un vestito viola = Anna puts on a purple dress

So:

• indossare focuses on the state of wearing
• mettersi focuses on the action of putting something on

That distinction is very useful in everyday Italian.