Jakkeslaget og innsnittet sitter riktig.

Because both nouns are in the definite singular form, and both are neuter nouns.

• et jakkeslag = a lapel

• jakkeslaget = the lapel

• et innsnitt = a dart / shaping seam
• innsnittet = the dart / the shaping seam

In Norwegian, the definite article is usually added to the end of the noun instead of being a separate word like the in English.

The dictionary forms are:

• et jakkeslag
• et innsnitt

So in this sentence, you are seeing the definite forms:

• jakkeslaget
• innsnittet

A learner should get used to recognizing noun patterns like this:

• et hus → huset
• et snitt → snittet
• et jakkeslag → jakkeslaget

Yes, literally sitte means to sit, but Norwegian uses it much more broadly than English does.

In clothing, tailoring, and placement contexts, sitte often means:

• to sit
• to fit
• to be positioned
• to lie correctly

So sitter riktig means something like:

• is positioned correctly
• sits right
• fits properly

In this sentence, it does not mean that the lapel and dart are physically sitting down. It is an idiomatic way to talk about how parts of a garment are placed or how they fall.

Because Norwegian verbs in the present tense do not change depending on whether the subject is singular or plural.

So:

• Jakkeslaget sitter riktig.
• Innsnittet sitter riktig.
• Jakkeslaget og innsnittet sitter riktig.

The verb stays sitter in all three cases.

This is different from English, where you would compare:

• The lapel sits right
• The lapel and the dart sit right

Norwegian does not make that change.

Here riktig functions adverbially, meaning correctly or properly.

Even though riktig is often introduced as an adjective meaning correct or right, in sentences like this it describes how something sits or is positioned:

• sitter riktig = sits correctly / is positioned properly

Compare:

• Det er riktig. = That is correct.
  Here it is more adjective-like.

• Det sitter riktig. = It sits correctly.
  Here it behaves more like an adverb in English.

This is very common in Norwegian: an adjective form can be used where English would prefer an adverb.

Not usually. Er korrekt / er riktig and sitter riktig are not the same.

• er riktig = is correct
• sitter riktig = is positioned/fitted correctly

So in this sentence, sitter riktig is about fit, placement, or alignment, not abstract correctness.

Because Norwegian usually expresses definiteness by adding it to the noun itself.

So instead of saying:

• the lapel
• the dart

Norwegian says:

• jakkeslaget
• innsnittet

This is one of the biggest structural differences from English. The the meaning is built into the word ending.

Because that would usually mean something more specific, like that lapel or the lapel in a more marked way, depending on the context.

In ordinary definite noun phrases, Norwegian often just uses the suffixed definite form:

• jakkeslaget
• innsnittet

You only add a separate determiner in certain situations, for example:

• det fine jakkeslaget = the nice lapel
• dette jakkeslaget = this lapel

So the sentence as given is completely normal.

Innsnitt is a tailoring/sewing term. It usually refers to a dart: a fold or seam sewn into fabric to shape the garment so it fits the body better.

That is why this sentence sounds like something from:

• tailoring
• sewing
• fashion
• garment fitting

So the whole sentence is about whether important parts of a garment are sitting where they should.

Yes. Norwegian loves compound nouns.

jakkeslag is built from:

• jakke = jacket
• slag = lapel / facing / a related older noun element in this compound

Together, jakkeslag means lapel.

The definite form is then:

• jakkeslaget = the lapel

Compound nouns are extremely common in Norwegian, so it is useful to learn to spot them.

Sometimes learners are tempted to use passer, but sitter is the more natural choice here.

Very roughly:

• passer often means fits, suits, or is suitable
• sitter often means sits/fits on the body / is positioned properly

For garment details like a lapel or a dart, sitter riktig sounds more idiomatic if you are talking about how they are placed on the garment.

The word order is straightforward:

• Jakkeslaget og innsnittet = subject
• sitter = verb
• riktig = adverbial complement

So the pattern is:

Subject + Verb + Adverb

That is the normal word order for a main clause in Norwegian when nothing special is being fronted.

The indefinite version would be:

• Et jakkeslag og et innsnitt sitter riktig.

That would mean something like A lapel and a dart are positioned correctly, though in real use the definite version is often more natural if you are talking about specific parts of a particular garment.

The original sentence uses the definite form because it is referring to the actual lapel and the actual dart under discussion.

You mostly learn noun gender together with the noun itself:

• et jakkeslag
• et innsnitt

There is not always a reliable way to guess gender from meaning alone, so it is best to memorize nouns with their article.

Once you know they are neuter singular nouns, the definite form -et makes sense:

• et jakkeslag → jakkeslaget
• et innsnitt → innsnittet

Yes, especially in contexts like:

• tailoring
• trying on clothes
• sewing instruction
• fashion critique
• garment construction

It sounds natural and professional. A native speaker might say it when checking whether the garment has been made or adjusted properly.

So even though the vocabulary is specialized, the grammar is completely normal everyday Norwegian.