Αυτό το μπεζ παλτό μου αρέσει περισσότερο από το μαύρο.

Because Greek normally uses a demonstrative + definite article + noun pattern.

So:

• αυτό = this
• το = the
• παλτό = coat

Together, αυτό το παλτό means this coat.

For an English speaker, the article may feel extra, because English says just this coat, not this the coat. But in standard Greek, αυτό το παλτό is the normal structure.

Παλτό is neuter.

You can tell from:

• the article το
• the demonstrative αυτό
• the adjective form μαύρο later in the sentence

They all match the noun in gender, number, and case.

So here:

• αυτό = neuter singular
• το = neuter singular
• μπεζ = indeclinable, so it does not change form
• παλτό = neuter singular

A useful point: many Greek nouns ending in -ό are neuter, and παλτό is one of them.

Μπεζ is one of those color words in Greek that is usually indeclinable, meaning it does not change form for gender, number, or case.

So you can have:

• το μπεζ παλτό
• η μπεζ φούστα
• ο μπεζ καναπές

By contrast, a regular adjective like μαύρος / μαύρη / μαύρο does change.

So:

• το μαύρο παλτό
• η μαύρη φούστα
• ο μαύρος καναπές

This is why μπεζ stays the same, but μαύρο is clearly in a neuter form.

Because Greek uses αρέσει in a different structure from English.

Literally, μου αρέσει means something like:

• it is pleasing to me
• or to me, it pleases

So in this sentence:

• μου = to me
• αρέσει = pleases / is pleasing

The thing being liked is actually the grammatical subject of the verb.

So Greek thinks more like:

• This beige coat pleases me more than the black one.

That is why the structure feels different from English I like this beige coat...

Because the verb agrees with the thing that is pleasing, not with μου.

Here, the subject is:

• Αυτό το μπεζ παλτό = this beige coat

That is singular, so the verb is singular:

• αρέσει = it pleases

If the subject were plural, you would use αρέσουν:

• Αυτά τα μπεζ παλτά μου αρέσουν...
• I like these beige coats...

So μου does not control the verb form; the noun being liked does.

Μου is the weak form of the pronoun meaning to me.

In this sentence, it is an indirect object clitic:

• μου αρέσει = it pleases me

This is extremely common with αρέσει / αρέσουν:

• Μου αρέσει ο καφές. = I like coffee.
• Μου αρέσουν οι ταινίες. = I like movies.

So when you see μου αρέσει, think I like, but remember the literal Greek structure is different.

Here περισσότερο means more.

It is being used adverbially with μου αρέσει:

• μου αρέσει περισσότερο = I like it more

So the sentence compares two things:

• this beige coat
• the black one

and says the first is liked more than the second.

A close English restructuring would be:

• This beige coat pleases me more than the black one.

Yes, very often Greek speakers use πιο in comparisons, and in everyday speech that can sound very natural.

For example, you may hear:

• Αυτό το μπεζ παλτό μου αρέσει πιο πολύ από το μαύρο.

That also means I like this beige coat more than the black one.

In your sentence, περισσότερο is perfectly correct and clear. It is just another way to express the comparative idea more.

Yes, από very often means from, but after a comparative it also means than.

So:

• περισσότερο από... = more than...
• μεγαλύτερο από... = bigger than...
• καλύτερο από... = better than...

In your sentence:

• περισσότερο από το μαύρο = more than the black one

This is a very common use of από, so it is worth learning as a standard comparison pattern.

Because Greek, like English, can omit the noun when it is obvious from context.

So:

• το μαύρο literally = the black
• but it really means the black one
• with παλτό understood

This is called using the adjective substantively: the adjective stands in for the noun.

So the full idea is:

• Αυτό το μπεζ παλτό μου αρέσει περισσότερο από το μαύρο παλτό.

But Greek normally leaves out the repeated noun because it is already understood.

Because the adjective is standing in for a noun, so it needs the article.

• το μαύρο = the black one
• not just black

Without the article, it would not work the same way here.

This is similar to English expressions like:

• the black one
• the red one
• the big one

Greek does this very naturally with article + adjective.

Here it is nominative, because Αυτό το μπεζ παλτό is the subject of αρέσει.

However, for neuter singular, the nominative and accusative forms are the same:

• αυτό

So even though the form looks the same, its function here is nominative.

That can be confusing for English speakers, especially because in English the liked thing feels like an object, but in Greek with αρέσει, it is the subject.

Yes, Greek word order is more flexible than English, though not completely free.

Your sentence is perfectly natural:

• Αυτό το μπεζ παλτό μου αρέσει περισσότερο από το μαύρο.

But you might also hear variations such as:

• Μου αρέσει περισσότερο αυτό το μπεζ παλτό από το μαύρο.

The basic meaning stays the same, but changing the order can shift the emphasis a little.

The version you were given is very straightforward and learner-friendly because it starts with the thing being talked about.

The demonstrative, article, and any changeable adjectives would agree with the noun.

For example:

Feminine

• Αυτή η μαύρη φούστα μου αρέσει περισσότερο από τη μπεζ.
• I like this black skirt more than the beige one.

Masculine

• Αυτός ο μαύρος καναπές μου αρέσει περισσότερο από τον μπεζ.
• I like this black sofa more than the beige one.

Compare that with your neuter sentence:

• Αυτό το μπεζ παλτό μου αρέσει περισσότερο από το μαύρο.

So the key thing is agreement:

• αυτός / αυτή / αυτό
• ο / η / το
• adjective forms like μαύρος / μαύρη / μαύρο

A very useful pattern is:

• [thing] + μου αρέσει + περισσότερο από + [other thing]

For example:

• Αυτό το βιβλίο μου αρέσει περισσότερο από το άλλο.

• I like this book more than the other one.

• Η μπλε τσάντα μου αρέσει περισσότερο από τη μαύρη.
• I like the blue bag more than the black one.

So your sentence is a great model for saying I like X more than Y in Greek.