Mislim da ti ta plava haljina dobro stoji.

Ti is the unstressed dative form of tebi, meaning to you.

In this sentence, stajati in the sense of to look good on / to suit takes a person in the dative:

• Haljina ti dobro stoji. = The dress looks good on you.
• literally, something like The dress stands well to you

So ti is not the subject. It means the dress suits you.

If you want extra emphasis, you can use tebi instead:

• Mislim da tebi ta plava haljina dobro stoji.

That sounds more like I think that blue dress looks good on you specifically.

Yes, the basic meaning of stajati is to stand. But with clothes, colors, hairstyles, and similar things, it often means:

• to suit
• to look good on someone
• to be flattering

So here:

• ta plava haljina dobro stoji means that blue dress looks good
• ti ta plava haljina dobro stoji means that blue dress looks good on you

This is a very common use in Croatian.

Examples:

• Crvena ti dobro stoji. = Red looks good on you.
• Kratka kosa joj lijepo stoji. = Short hair looks nice on her.

Because haljina is the subject of stoji.

The thing that is doing the suiting / looking good is the dress, grammatically speaking. So:

• ta plava haljina = subject
• stoji = verb agreeing with that subject
• ti = dative pronoun meaning to you / on you

That is why haljina stays in the nominative singular.

Because the subject is haljina, which is:

• feminine
• singular

The present tense of stajati for he/she/it is stoji.

So:

• haljina stoji
• suknja stoji
• kaput stoji

If the subject were plural, the verb would change:

• Te cipele ti dobro stoje. = Those shoes look good on you.

So the verb agrees with haljina, not with ti.

Ta is a demonstrative adjective, meaning that.

So:

• ta haljina = that dress
• ta plava haljina = that blue dress

It points to a specific dress, probably one already visible or already mentioned.

A useful thing for English speakers: Croatian has no articles like the or a, so words like taj / ta / to sometimes cover part of the job that English articles do in context.

Depending on the situation, ta plava haljina can feel like:

• that blue dress
• or, more loosely in context, the blue dress

Yes. In Croatian, adjectives must agree with the noun in:

• gender
• number
• case

Here haljina is:

• feminine
• singular
• nominative

So both modifiers also appear in feminine singular nominative:

• ta = feminine singular nominative
• plava = feminine singular nominative
• haljina = feminine singular nominative noun

That is why you get:

• ta plava haljina

If the noun changed, the adjective and demonstrative would change too. For example:

• taj plavi kaput = that blue coat
• to plavo odijelo = that blue suit
• te plave cipele = those blue shoes

After mislim, Croatian normally uses a da-clause to introduce what you think:

• Mislim da... = I think that...

So:

• Mislim da ti ta plava haljina dobro stoji.
• literally: I think that that blue dress looks good on you.

This is the normal Croatian pattern. English can sometimes omit that, but Croatian usually keeps da here.

The main reason is that ti is a clitic. Croatian clitics are unstressed short forms, and they usually appear very early in the clause.

After da, the clitic ti naturally comes near the beginning:

• Mislim da ti ta plava haljina dobro stoji.

This is a very natural, neutral word order.

Croatian word order is flexible, but not random. Moving things around changes emphasis. The version in your sentence is the most ordinary and idiomatic one.

Also, the adverb dobro usually comes before the verb here:

• dobro stoji = looks good / suits well

Because dobro is an adverb, not an adjective.

It modifies the verb stoji, so it means well:

• dobro stoji = looks good / suits well

If you used dobra, that would be an adjective, and it would need to describe a noun, not the verb.

So compare:

• Haljina je dobra. = The dress is good.
• Haljina ti dobro stoji. = The dress looks good on you.

Yes, but the nuance changes.

• ti is the normal unstressed form
• tebi is the stressed form, usually used for emphasis, contrast, or clarity

So:

• Mislim da ti ta plava haljina dobro stoji. = neutral
• Mislim da tebi ta plava haljina dobro stoji. = emphasis on you

For example, tebi works well in contrast:

• Tebi ta plava haljina dobro stoji, ali meni ne.
• That blue dress looks good on you, but not on me.

Usually it means it looks good on you or it suits you, especially in terms of appearance.

It does not necessarily mean the size is correct or that it is comfortable.

So this sentence is more about how the dress looks on the person than about exact fit.

If you want to talk specifically about size or fit, Croatian may use other expressions, depending on what you mean:

• Dobro ti pristaje. = It suits you / it looks good on you.
• Veličina ti odgovara. = The size fits you.
• Preuska je. = It is too tight.
• Preširoka je. = It is too loose / too wide.

Yes.

• Ta plava haljina ti dobro stoji. = That blue dress looks good on you.

Adding Mislim makes it slightly softer or more personal:

• Mislim da... = I think...

That can sound a bit less direct, more conversational, or more polite in some contexts. English does this too with I think.

So both are correct, but they are not identical in tone:

• Ta plava haljina ti dobro stoji. = direct statement
• Mislim da ti ta plava haljina dobro stoji. = personal opinion / softer statement