La corbata azul te queda bien con el traje gris.

Here quedar bien is an idiomatic expression. It means things like:

• to look good on someone
• to suit someone
• to go well with something

So La corbata azul te queda bien con el traje gris means the blue tie looks good on you, especially together with the grey suit.

Even though quedar often means to stay or to remain, in clothing contexts quedar bien is very common for looking good / suiting someone.

Te means to you here. It is not reflexive in this sentence.

The structure is:

[thing] + te + queda bien

So literally, it is something like:

The blue tie looks good to you / on you

More naturally in English: The blue tie suits you or looks good on you.

Other forms would be:

• me queda bien = it looks good on me
• te queda bien = it looks good on you
• le queda bien = it looks good on him/her/you formal
• nos queda bien = it looks good on us
• os queda bien = it looks good on you all, common in Spain
• les queda bien = it looks good on them / you all formal

Because the verb agrees with la corbata azul, which is the subject.

The subject is la corbata = the tie, which is third person singular, so the verb is queda.

It does not agree with te.

Compare:

• La corbata te queda bien = The tie looks good on you
• Las corbatas te quedan bien = The ties look good on you

So if the subject becomes plural, the verb becomes plural too.

Because bien is an adverb, and it modifies the verb phrase queda.

In quedar bien, bien means well or good-looking in the sense of appearance.

Buena would be an adjective, and adjectives describe nouns, not verbs.

So:

• te queda bien = it looks good on you
• una buena corbata = a good tie

That is why bien is correct here.

Because in normal Spanish, descriptive adjectives like colors usually come after the noun.

So the neutral, standard order is:

• corbata azul = blue tie
• traje gris = grey suit

Putting the adjective before the noun is usually unusual with colors and can sound poetic, literary, or strongly emphatic.

For everyday Spanish, noun + color adjective is the pattern to remember.

Spanish often uses definite articles more freely than English, especially with clothing and with things that are specific or understood from context.

So:

• la corbata azul = the blue tie
• el traje gris = the grey suit

This suggests the speaker has a particular tie and a particular suit in mind.

In English, depending on context, we might say:

• The blue tie looks good on you with the grey suit
• A blue tie looks good on you with a grey suit
• Your blue tie looks good with your grey suit

Spanish chooses the article based on how specific the items are in context. Here, la and el sound natural for specific items.

Because many color adjectives that end in a consonant have the same form for masculine and feminine in the singular.

So:

• la corbata azul
• el traje azul
• la chaqueta gris
• el pantalón gris

But they do change in the plural:

• corbatas azules
• trajes azules
• chaquetas grises
• trajes grises

So they are not completely unchanged; they just do not show masculine/feminine difference in the singular.

It means with the grey suit, in the sense of together with it or when paired with it.

So the idea is not just that the tie looks good on you by itself, but that it looks good on you as a combination with the grey suit.

In other words, con here expresses matching or pairing:

• the tie suits you
• and it goes well with the grey suit

Yes. Spanish word order is more flexible than English.

A very natural alternative would be:

Te queda bien la corbata azul con el traje gris.

This version puts the pronoun and verb first, which is very common in speech.

The difference is mostly about emphasis:

• La corbata azul te queda bien... focuses first on the blue tie
• Te queda bien la corbata azul... focuses first on how it looks on you

Both are correct.

Yes. In Spain especially, sentar bien is also very common for clothes, hairstyles, colors, and similar things that suit someone.

So you could say:

La corbata azul te sienta bien con el traje gris.

Both te queda bien and te sienta bien can work here.

A useful rough distinction is:

• quedar bien often suggests it looks good on you / it goes well
• sentar bien often suggests it suits you especially well

In everyday Spanish, the two are often very close in meaning, and native speakers use both.