Na co dzień noszę dżinsy i wygodną bluzę.

Yes, na co dzień is a very common fixed expression. It means on a daily basis, every day, or in everyday life.

In this sentence, it tells you that the speaker is talking about their usual, everyday clothing habits.

Examples:

• Na co dzień pracuję w domu. — I work from home on a daily basis.
• Na co dzień nie piję kawy. — I don’t normally drink coffee.

It is best learned as a whole phrase.

Noszę is the 1st person singular form of the verb nosić, which means to wear, to carry, or to bear, depending on context.

Here it means I wear.

Conjugation of nosić in the present tense:

• ja noszę — I wear
• ty nosisz — you wear
• on/ona/ono nosi — he/she/it wears
• my nosimy — we wear
• wy nosicie — you all wear
• oni/one noszą — they wear

The -ę ending is a common 1st person singular ending in Polish.

In Polish, dżinsy is normally used as a plural noun, just like English jeans.

So:

• noszę dżinsy — I wear jeans

Even if you think of it as one item of clothing, grammatically it is plural.

Other similar plural clothing words include:

• spodnie — trousers / pants
• szorty — shorts

So using the plural here is completely normal.

Because bluzę is the accusative singular form of bluza, and the adjective has to match it.

The verb nosić usually takes a direct object in the accusative case:

• noszę co? — what do I wear?

So:

• dictionary form: wygodna bluza — a comfortable sweatshirt/hoodie
• in the sentence: noszę wygodną bluzę — I wear a comfortable sweatshirt/hoodie

Both words change because they are feminine singular in the accusative:

• wygodna → wygodną
• bluza → bluzę

A very common clue is the ending -a in the dictionary form. Most Polish nouns ending in -a are feminine.

So:

• bluza — feminine
• wygodna bluza — the adjective also takes feminine form

That is why in the accusative singular you get:

• wygodną bluzę

Bluza usually means a casual upper-body garment such as a sweatshirt, and sometimes also a hoodie, depending on context.

If someone wants to be more specific, they might say:

• bluza z kapturem — hoodie
• bluza — sweatshirt / casual top

So in this sentence, wygodną bluzę most naturally means a comfortable sweatshirt or a comfortable hoodie.

It actually already is in the form needed here. With many plural inanimate nouns, the nominative plural and accusative plural are the same.

So:

• to są dżinsy — these are jeans
• noszę dżinsy — I wear jeans

The form stays dżinsy.

Dżinsy is pronounced approximately like JEEN-sih.

A rough breakdown:

• dż sounds like the j in jam
• i here helps soften the sound pattern, but the overall beginning still sounds close to English jean
• y is a Polish vowel that does not exist exactly in English; it is somewhat like a short, central i sound

So for an English speaker, jean-sy is a decent approximation, though not perfect.

Because Polish usually drops subject pronouns when the verb already makes the subject clear.

Noszę already means I wear, so ja is not necessary.

You could say:

• Ja noszę dżinsy i wygodną bluzę.

But that would usually add emphasis, for example:

• I wear jeans and a comfortable sweatshirt.

In neutral sentences, Polish normally leaves the pronoun out.

Yes. Polish word order is more flexible than English word order, though some versions sound more natural in neutral speech.

The original sentence:

• Na co dzień noszę dżinsy i wygodną bluzę.

Other possible orders:

• Noszę na co dzień dżinsy i wygodną bluzę.
• Dżinsy i wygodną bluzę noszę na co dzień.

The original version is very natural because it puts the time/frequency expression first: na co dzień.

Not exactly, though they are close.

• codziennie means every day
• na co dzień means usually / in everyday life / on a daily basis

Compare:

• Codziennie noszę dżinsy. — I wear jeans every day.
• Na co dzień noszę dżinsy. — In everyday life / usually, I wear jeans.

The second one sounds a bit broader and more about normal habit or lifestyle.

Usually the accusative.

That is why:

• bluza → bluzę
• wygodna → wygodną

More examples:

• Noszę sukienkę. — I wear a dress.
• Noszę czarną kurtkę. — I wear a black jacket.
• Noszę okulary. — I wear glasses.

So this sentence is a good example of nosić + accusative.

Usually yes. Wygodny / wygodna / wygodne means comfortable or convenient, depending on context.

In clothing contexts, it usually means comfortable:

• wygodne buty — comfortable shoes
• wygodna bluza — comfortable sweatshirt

In other contexts, it can mean convenient:

• wygodny fotel — a comfortable armchair
• wygodny termin — a convenient date/time

So here comfortable is the best translation.