Jeg lar være å bestille noe nytt før jeg har prøvd riktig størrelse i prøverommet.

Å la være å + infinitive is a common Norwegian expression meaning to refrain from doing something, to avoid doing something, or simply not to do something.

So:

Jeg lar være å bestille ...
= I refrain from ordering ...
= I don’t order ...

It is an idiomatic expression, so it is best learned as a fixed pattern:

• Jeg lar være å si noe. = I refrain from saying anything.
• Hun lot være å komme. = She didn’t come / She refrained from coming.

In everyday English, this sentence might sound more natural as I’m not going to order anything new until ...

Because the pattern is:

å la være å + infinitive

So the second å introduces the verb that is being avoided.

Structure:

• lar være = refrain / leave it alone
• å bestille = to order

Together:

• Jeg lar være å bestille = I refrain from ordering

This is similar to fixed verb patterns in English, where certain verbs are followed by another verb in a particular form.

After a verb phrase like lar være å bestille or in many similar contexts, Norwegian often uses noe where English might expect anything.

So:

• noe nytt = anything new / something new, depending on context

In this sentence, noe nytt is best understood as anything new:

• Jeg lar være å bestille noe nytt ...
  = I refrain from ordering anything new ...

If you said ingenting nytt, that would mean nothing new, which changes the structure and emphasis:

• Jeg bestiller ingenting nytt. = I’m ordering nothing new / I’m not ordering anything new.

That is possible Norwegian, but it is not the same construction as the sentence you were given.

Nytt is the neuter form of the adjective ny (new).

The word noe is treated as neuter, so the adjective also takes the neuter form:

• en ny jakke = a new jacket
• et nytt plagg = a new garment
• noe nytt = something/anything new

So nytt is not a different word; it is just the correct grammatical form of ny here.

Har prøvd is the present perfect: have tried.

In this sentence, it shows that the trying must happen before the ordering. The idea is:

I won’t order anything new until I have tried the right size in the fitting room.

So før jeg har prøvd emphasizes completed action before the next step.

Compare:

• før jeg har prøvd riktig størrelse
  = before I have tried the right size

• før jeg prøver riktig størrelse
  = before I try the right size

Both can be grammatical in some contexts, but har prøvd is more natural when the speaker means the trying should be completed first.

No. After før, you get a subordinate clause, and Norwegian uses subordinate clause word order.

Main clause:

• Jeg har prøvd riktig størrelse.

Subordinate clause:

• før jeg har prøvd riktig størrelse

Notice that the subject jeg comes before the auxiliary har. That is the normal pattern in subordinate clauses.

This is different from main clauses with inversion, such as:

• Nå har jeg prøvd riktig størrelse.

So a useful thing to remember is:

• main clause: word order can change because of V2 rules
• subordinate clause after words like før, fordi, at, når: the subject usually comes before the verb

It means the correct size or the right size.

• riktig = correct / right
• størrelse = size

In Norwegian, you often do not need an article where English would use the. So:

• prøvd riktig størrelse
  literally: tried correct size
  natural English: tried the right size

That is normal Norwegian usage.

Because Norwegian often leaves out the article in expressions where English would include one.

So:

• prøve riktig størrelse = try the right size
• finne riktig farge = find the right color
• velge riktig modell = choose the right model

This is a very common pattern. English tends to say the right size, but Norwegian can simply say riktig størrelse.

Prøverommet means the fitting room or the changing room.

It is made up of:

• prøverom = fitting room / changing room
• -met = the definite ending for a neuter noun

So:

• et prøverom = a fitting room
• prøverommet = the fitting room

Norwegian often adds definiteness as an ending instead of using a separate word like the.

Because i is the normal preposition for being inside an enclosed space or room.

So:

• i prøverommet = in the fitting room
• i butikken = in the store
• i rommet = in the room

Using på would usually not sound natural here. På is more common for surfaces, institutions, events, websites, and some fixed expressions, but a fitting room is treated as an actual room you are in.

Most likely, yes. Å bestille usually means to order or to book.

Depending on context:

• bestille klær på nettet = order clothes online
• bestille bord = book a table
• bestille time = book an appointment

In your sentence, because it mentions size and the fitting room, bestille probably means order clothing, perhaps online or from a store system.

A different verb like kjøpe would mean buy, which is not quite the same thing.

Yes. The sentence is grammatical, but in everyday speech many people might choose a simpler version, depending on the situation.

For example:

• Jeg bestiller ikke noe nytt før jeg har prøvd riktig størrelse i prøverommet. = I’m not ordering anything new until I’ve tried the right size in the fitting room.

This version is more direct than jeg lar være å bestille.

So the original sentence is fine, but lar være å adds a slightly more deliberate sense of refraining or holding back.

The sentence has two parts:

Jeg lar være å bestille noe nytt
= main clause

før jeg har prøvd riktig størrelse i prøverommet
= subordinate clause introduced by før (before / until depending on English wording)

Piece by piece:

• Jeg = I
• lar være å = refrain from / don’t
• bestille = order
• noe nytt = anything new
• før = before / until
• jeg har prøvd = I have tried
• riktig størrelse = the right size
• i prøverommet = in the fitting room

A natural English rendering is: I won’t order anything new until I’ve tried the right size in the fitting room.