После душа я надеваю пижаму и беру тёплый халат.

Because после always requires the genitive case in Russian.

• душ = shower in the dictionary form here
• Genitive singular of душ is душа

So:

• после душа = after the shower / after showering

This is a very common pattern:

• после работы = after work
• после школы = after school
• после ужина = after dinner

Because пижама is the direct object of надеваю, so it goes into the accusative case.

The noun пижама is feminine, and many feminine nouns ending in -а change like this:

• nominative: пижама
• accusative: пижаму

So:

• я надеваю пижаму = I put on pajamas

The same pattern appears in many words:

• книга → книгу
• рубашка → рубашку
• шапка → шапку

Because халат is also a direct object here, and it is masculine inanimate.

For masculine inanimate nouns, the accusative looks the same as the nominative:

• nominative: тёплый халат
• accusative: тёплый халат

So after беру:

• беру тёплый халат = I take a warm robe

If the noun were animate, the accusative would look different:

• я вижу брата = I see my brother

But халат is inanimate, so no change.

This is a very common learner question.

• надевать / надеть = to put on a piece of clothing
• одевать / одеть = to dress someone

So:

• я надеваю пижаму = I put on pajamas
• я одеваю ребёнка = I dress the child

A useful memory trick is:

• надеть что? = put on what?
• одеть кого? = dress whom?

So in this sentence, пижаму is the clothing item, which is why надеваю is correct.

Because беру literally means I take.

So the sentence describes two actions:

1. я надеваю пижаму = I put on pajamas
2. и беру тёплый халат = and I take a warm robe

This may imply:

• the speaker puts on pajamas first
• then picks up the robe, perhaps to wear it next

If the speaker wanted to say they actually put on the robe, they could say:

• я надеваю тёплый халат

So беру is not wrong; it just focuses on taking/picking up the robe, not necessarily wearing it yet.

In Russian, the present tense is often used for habitual actions, just like the English present simple.

So:

• После душа я надеваю пижаму и беру тёплый халат
  = After showering, I put on my pajamas and take a warm robe.

This can mean a usual routine, not only something happening right now.

Russian present tense often covers:

• what is happening now
• what someone usually does
• general habits

So this usage is completely normal.

Yes, often it could.

Russian often leaves out the subject pronoun when it is clear from the verb ending.

So both are possible:

• После душа я надеваю пижаму и беру тёплый халат
• После душа надеваю пижаму и беру тёплый халат

The verb forms already show I:

• надеваю = I put on
• беру = I take

Including я can add clarity, contrast, or emphasis, but it is not always necessary.

Here халат means a robe or dressing gown.

In this context:

• тёплый халат = a warm robe

Be aware that халат can also mean other robe-like garments depending on context, such as:

• a bathrobe
• a dressing gown
• sometimes even a work coat or lab coat

But in a sentence about after a shower, robe/bathrobe is the natural meaning.

Yes, Russian word order is flexible.

This version is natural because it starts with the time phrase:

• После душа = after showering

Then it gives the actions:

• я надеваю пижаму
• и беру тёплый халат

You could rearrange parts for emphasis, for example:

• Я после душа надеваю пижаму и беру тёплый халат.
• Пижаму я надеваю после душа и беру тёплый халат.

But the original order is the most neutral and natural for everyday speech.

Тёплый is an adjective meaning warm, and it agrees with халат in:

• gender: masculine
• number: singular
• case: accusative, which here looks like nominative because халат is inanimate

So:

• тёплый халат = warm robe

If the noun changed, the adjective would change too:

• тёплая пижама = warm pajamas / warm pajama set
• тёплую пижаму = warm pajamas as a direct object
• тёплые вещи = warm clothes

This agreement is a basic and important part of Russian grammar.

Both spellings may be seen in real life, but тёплый is the more precise spelling.

In many Russian texts, especially informal ones, ё is often replaced by е:

• тёплый
• теплый

They are understood as the same word.

However, learners should know that the pronunciation is with ё, not plain е. So it sounds like:

• тЁплый

Using ё is especially helpful for learners because it shows the correct pronunciation and stress more clearly.