Bu koyu renkli ceket sana çok iyi duruyor.

Great question. Durmak has several related meanings in Turkish, including to stop, to stand, and to look / sit / hang in a certain way.

In clothing contexts, üstünde iyi durmak means:

• to look good on someone
• to suit someone
• literally something like to stand well on someone

So in Bu koyu renkli ceket sana çok iyi duruyor, duruyor does not mean is stopping. It means the jacket looks good on you.

You will often hear:

• Bu elbise sende güzel duruyor. = This dress looks nice on you.
• Bu renk sana yakışıyor. = This color suits you.

Because the verb pattern here requires the dative case.

• sen = you
• sana = to you

With iyi durmak in this sense, Turkish uses the pattern:

• bir şey birine iyi duruyor
  = something looks good on someone

So:

• ceket = jacket
• sana = on you / to you
• iyi duruyor = looks good

Even though English says on you, Turkish uses the dative here, not a separate word meaning on.

Koyu renkli means dark-colored.

It is made of:

• koyu = dark
• renk = color
• renkli = colored / having color

So koyu renkli ceket literally means something like:

• dark-colored jacket

This is a very natural Turkish way to describe color.

Compare:

• açık renkli gömlek = light-colored shirt
• koyu renkli pantolon = dark-colored trousers

The ending -li / -lı / -lu / -lü means with, having, or characterized by.

So:

• renk = color
• renkli = colored / having color

In koyu renkli, the idea is having a dark color or dark-colored.

This -li ending is very common:

• tuz = salt → tuzlu = salty / with salt
• süt = milk → sütlü = milky / with milk
• yağ = oil/fat → yağlı = oily / fatty

So renkli is an adjective formed from the noun renk.

Because çok iyi is modifying the verb phrase duruyor.

• iyi durmak = to look good
• çok iyi durmak = to look very good

So:

• çok = very
• iyi = well / good
• duruyor = looks / is looking

Together:

• çok iyi duruyor = looks very good

This word order is very normal in Turkish: adverbs usually come before the verb.

Duruyor is in the present continuous form: -yor.

From:

• durmak = to stand / stop / look a certain way
• duruyor = is standing / is looking / looks

In Turkish, the -yor form is often used not only for actions happening right now, but also for current states, general present situations, and things that are true at the moment of speaking.

So here duruyor can be understood as:

• is looking
• looks

Both are good English translations depending on context.

Because Turkish expresses that idea differently.

English says:

• It looks good on you.

Turkish says:

• Sana iyi duruyor.
• literally: It stands/looks good to you

So the relationship that English expresses with on is handled in Turkish by the structure using dative case (sana).

This is very common when learning Turkish: you often cannot translate each English preposition word-for-word.

In this sentence, bu means this.

• bu ceket = this jacket

Turkish has a basic contrast like:

• bu = this
• şu = that / this over there / that one
• o = that

Here bu points to something near the speaker or immediately being referred to.

Because when an adjective directly describes a noun, it usually comes before the noun in Turkish.

So:

• koyu renkli ceket = dark-colored jacket

If you say:

• Ceket koyu renkli. that means:
• The jacket is dark-colored.

So the difference is:

• koyu renkli ceket = adjective + noun
• ceket koyu renkli = noun + predicate adjective

Both are correct, but they do different jobs.

Yes, absolutely. Bu ceket sana çok yakışıyor is very natural.

Both sentences can mean something like:

• This jacket suits you very well.

But there is a slight nuance:

• sana iyi duruyor focuses more on how the item looks on you physically
• sana yakışıyor focuses more on how it suits you, your style, appearance, or overall impression

Often they are quite close in everyday speech.

Compare:

• Bu ceket sana çok iyi duruyor. = This jacket looks really good on you.
• Bu ceket sana çok yakışıyor. = This jacket really suits you.

No, because ceket is the subject here, so it stays in the basic form.

The structure is:

• Bu koyu renkli ceket = subject
• sana = indirect object / dative phrase
• çok iyi duruyor = verb phrase

Turkish often leaves the subject in its plain dictionary form when it is not the direct object of a verb.

So:

• ceket is just jacket
• no extra ending is needed here

Yes. Turkish word order is flexible, although some orders sound more neutral than others.

The neutral order here is:

• Bu koyu renkli ceket sana çok iyi duruyor.

But you could also hear:

• Sana bu koyu renkli ceket çok iyi duruyor.
• Bu ceket sana çok iyi duruyor.

Changing the order often changes the focus or emphasis, not the basic meaning.

For example:

• Sana bu koyu renkli ceket çok iyi duruyor.
  puts a bit more focus on you

• Bu koyu renkli ceket sana çok iyi duruyor.
  is a very straightforward, neutral statement

A rough pronunciation guide is:

Boo ko-yoo renk-lee je-ket sa-na chok ee-yee doo-roo-yor

A few helpful notes:

• c in Turkish is like English j in jam
• ç is like ch
• jacket-like spelling does not apply here: ceket starts with a j sound
• ı is a vowel that does not exist in English; but this sentence does not contain ı
• çok sounds like chok
• iyi is pronounced clearly as two syllables: ee-yee

So ceket is approximately je-ket, not seh-ket.