Ta garderoba jest znacznie większa.

Because garderoba is a feminine noun in Polish, and ta is the feminine singular form of this.

Polish this changes according to gender:

• ten = masculine
• ta = feminine
• to = neuter

So:

• ta garderoba = this wardrobe / this walk-in closet / this dressing room

The adjective later in the sentence also matches this feminine noun: większa.

Garderoba can mean a few related things depending on context:

• a walk-in closet
• a dressing room
• sometimes a cloakroom
• less often, a wardrobe in the sense of someone’s collection of clothes

So the exact translation depends on the situation. In a home or apartment context, garderoba often means walk-in closet or dressing room.

Because większa agrees with garderoba, which is feminine singular.

The comparative adjective bigger changes for gender and number:

• większy = masculine singular
• większa = feminine singular
• większe = neuter singular or non-masculine personal plural

Since garderoba is feminine, the correct form is:

• Ta garderoba jest większa.

Yes. Większa is the comparative form of duża / wielka in the sense of big / large.

The basic idea is:

• duży / duża / duże = big
• większy / większa / większe = bigger

So większa means bigger.
In the sentence, it is the predicate adjective after jest:

• Ta garderoba jest większa. = This dressing room / closet is bigger.

Znacznie means considerably, significantly, or much.

So:

• większa = bigger
• znacznie większa = much bigger / considerably bigger

It strengthens the comparison.

Other common intensifiers you might see are:

• trochę większa = a little bigger
• dużo większa = much bigger
• o wiele większa = a lot bigger / much bigger
• znacznie większa = significantly bigger

Yes. A comparative like większa usually implies comparison with something else, even if that thing is not stated.

So Ta garderoba jest znacznie większa means:

• This wardrobe / dressing room is much bigger

But in natural context, it usually really means:

• This one is much bigger than the other one
• This dressing room is much bigger than before
• This closet is much bigger than that one

If you want to state the comparison explicitly, you can add niż (than):

• Ta garderoba jest znacznie większa niż tamta.
  = This one is much bigger than that one.

Here jest is the normal and correct form. It means is.

• Ta garderoba jest znacznie większa.

In standard Polish, you normally keep jest in this kind of sentence.
Unlike Russian, Polish does use the present-tense form of to be.

In very informal or poetic language, people may sometimes omit it in certain contexts, but for learners the safe rule is:

• use jest in sentences like this

Not in normal standard Polish. That sounds incomplete or nonstandard.

The standard sentence is:

• Ta garderoba jest znacznie większa.

So for learners, definitely include jest.

Yes, Polish word order is flexible, but some versions sound more natural than others.

The most neutral order is:

• Ta garderoba jest znacznie większa.

You may also hear:

• Ta garderoba jest większa znacznie — possible, but less natural in ordinary speech
• Znacznie większa jest ta garderoba — more marked, with emphasis

For everyday use, stick with:

• subject + jest + znacznie + comparative adjective

A rough pronunciation guide is:

• większa ≈ VYENG-ksha

A few useful details:

• wię sounds roughly like vyen
• ksz sounds like ksh
• rz after sz is not pronounced separately here; the cluster simplifies in speech

If you want it more slowly:

• więk-sza

The stress is on the second-to-last syllable:

• WIĘK-sza

Yes, you can say that too.

• Ta garderoba jest znacznie większa = This dressing room is much bigger
• Garderoba jest znacznie większa = The dressing room / wardrobe is much bigger

Adding ta makes it more specific and often contrasts it with another one:

• this one

Without ta, the sentence is still correct, but it may sound less contrastive.

It is in the nominative case because it is the subject of the sentence.

• Ta garderoba = subject
• jest = verb
• znacznie większa = predicate adjective

The adjective większa also appears in the nominative feminine singular form to match the subject.

Yes. Dużo większa is very common and natural.

Compare:

• znacznie większa = significantly / considerably bigger
• dużo większa = much bigger
• o wiele większa = much bigger / far bigger

They are all correct, but the tone is slightly different:

• znacznie sounds a bit more formal or precise
• dużo sounds very everyday and conversational

Yes. The comparative większy / większa / większe is historically related to wielki (great / large) and is used as the regular comparative meaning bigger / larger.

In modern Polish, learners usually just remember:

• duży = big
• większy = bigger

So even though the forms do not look very similar, this is a normal adjective comparison pair in Polish:

• duża garderoba = a big dressing room
• większa garderoba = a bigger dressing room

Sometimes, but this is where English speakers need to be careful.

English wardrobe often means a large clothes cabinet. In Polish, that piece of furniture is more often:

• szafa

Meanwhile, garderoba often means:

• dressing room
• walk-in closet
• cloakroom

So although garderoba can sometimes overlap with English wardrobe, it often does not mean the same thing as the furniture item. Context matters a lot here.