В воскресенье я надела коричневое пальто и пошла в музей.

In Russian, в + accusative is commonly used with days of the week to mean on a specific day.

• в воскресенье = on Sunday
• в понедельник = on Monday

Here, воскресенье is in the accusative case, but for this noun the accusative looks the same as the nominative, so the form does not change.

Also, the first word is capitalized simply because it starts the sentence.

Both verbs are in the past tense feminine singular.

That tells you the speaker is female.

• я надела = I put on (said by a woman)
• я пошла = I went (said by a woman)

If the speaker were male, you would get:

• я надел
• я пошёл

This is a very important feature of Russian past tense: it agrees with the gender of the subject.

This is a very common learner question.

In standard Russian:

• надеть = to put on something on yourself
• одеть = to dress someone else

So:

• Я надела пальто = I put on a coat
• Я одела ребёнка = I dressed the child

Native speakers sometimes mix these verbs in casual speech, but in standard Russian, надела пальто is the correct choice here.

The adjective коричневое agrees with the noun пальто.

Пальто is:

• singular
• neuter
• inanimate

So the adjective must also be in the matching form:

• коричневое пальто = brown coat

This is the neuter singular form of the adjective.

Пальто is an indeclinable noun in modern Russian. That means its form stays the same in different cases.

So you get:

• пальто
• в пальто
• без пальто
• надела пальто

The word came into Russian from another language, and words like this often do not change form.

The difference is mainly about aspect and the type of action.

• пошла is from пойти, a perfective verb
• шла is from идти, an imperfective verb

In this sentence, пошла presents the action as a completed event in the sequence:

• she put on her coat
• she went to the museum

So пошла fits well in a narrative about what happened.

If you said шла, it would focus more on the process of walking, not simply the fact that she went.

Yes, literally идти / пойти are verbs of motion for going on foot.

So пошла в музей most literally means went/walked to the museum.

Russian often makes this distinction more clearly than English:

• пойти / идти = go on foot
• поехать / ехать = go by transport

English usually just says went, but Russian often chooses a more specific motion verb.

Because в can take different cases depending on meaning:

• в + accusative = motion into / to
• в + prepositional = location in

So:

• пошла в музей = went to the museum
• была в музее = was in the museum

Here the sentence describes movement toward a destination, so музей is in the accusative: в музей.

Russian has no articles like a or the.

So Russian simply says:

• пальто
• музей

Whether English should translate them as a coat, the coat, a museum, or the museum depends on context.

Yes, Russian word order is flexible.

В воскресенье я надела коричневое пальто и пошла в музей is a natural way to start with the time expression On Sunday.

You could also say:

• Я в воскресенье надела коричневое пальто и пошла в музей

That is also grammatical, but the emphasis changes slightly.

Russian often moves words around to highlight:

• time
• contrast
• topic/focus
• style

So the sentence begins with В воскресенье because the speaker is setting the time frame first.

This is a normal Russian way to describe a sequence of completed actions.

• надела ... и пошла ... = put on ... and went ...

Russian does not need an extra word like then here, because the order of the verbs already makes the sequence clear.

So the sentence naturally means:

• On Sunday, I put on a brown coat and went to the museum.

The main stresses are:

• в воскресе́нье
• я наде́ла
• кори́чневое
• пальто́
• и пошла́
• в музе́й

Stress matters a lot in Russian pronunciation, so it is useful to learn whole phrases with stress, not just isolated words.