Il metro da sarta resta in sartoria.

Yes. Metro can mean different things in Italian depending on context:

• a meter as a unit of length
• the subway/metro
• a measuring tape

Here, because of da sarta, it means measuring tape, specifically the flexible kind used for sewing.

So il metro da sarta is not a train system and not just the abstract unit meter. It is a physical tape measure.

In this sentence, da does not mean only from. It often introduces the idea of purpose, use, or type.

So metro da sarta means:

• a tape measure for a seamstress
• a tape measure used by a seamstress
• in more natural English, a dressmaker’s tape measure or tailor’s tape measure

This is a very common Italian pattern:

• occhiali da sole = sunglasses
• scarpe da tennis = tennis shoes
• camera da letto = bedroom

So da sarta describes what kind of metro it is.

No, not in this sentence.

Italian da has several meanings, and from is only one of them. Here it expresses function/type, not origin.

So:

• vengo da Roma = I come from Rome
• metro da sarta = tape measure for / used by a seamstress

A native English speaker often wants to read da the same way every time, but in Italian it is very flexible.

Because sarta is the feminine form, meaning seamstress or dressmaker.
The masculine form is sarto, meaning tailor.

So:

• sarto = male tailor
• sarta = female tailor / seamstress / dressmaker

In the expression metro da sarta, Italian usually refers to the kind of flexible measuring tape associated with sewing and dressmaking. That is why sarta sounds natural here.

You may also encounter metro da sarto, but metro da sarta is very common for the soft tape measure used in clothing work.

Resta is the third person singular present of restare.

So:

• restare = to stay, remain
• resta = he/she/it stays, remains

Here the subject is il metro da sarta, which is singular, so the verb is singular too:

• Il metro da sarta resta... = The dressmaker’s tape measure stays/remains...

Depending on context, restare can mean:

• to stay
• to remain
• to be left

Sartoria means tailor’s shop, tailoring shop, or tailoring workroom.

The preposition in is used because the idea is inside that place.

So:

• in sartoria = in the tailor’s shop / in the tailoring room

This is a normal location phrase in Italian.

Sartoria is the noun for the place where tailoring is done.

It can refer to:

• a tailor’s shop
• a tailoring workshop
• a sewing/tailoring department

It is related to:

• sarto = tailor
• sarta = seamstress
• sartoria = tailoring shop / tailoring

So in this sentence, it refers to the place, not the person.

Sometimes yes, but the meaning shifts a little.

• dal sarto = at the tailor’s / to the tailor
• in sartoria = in the tailor’s shop / in the tailoring workshop

Dal sarto focuses more on the person or business in a general way.
In sartoria focuses more on the physical place or work area.

So in this sentence, in sartoria sounds natural because the object is remaining in that location.

Yes, but it would mean something different.

• il metro da sarta = a dressmaker’s tape measure; a type of tape measure
• il metro della sarta = the seamstress’s tape measure; the tape measure belonging to the seamstress

So:

• da sarta = function/type
• della sarta = possession/ownership

That is an important distinction in Italian.

Because metro is a masculine singular noun here, so it takes il.

• il metro
• i metri

The article also shows that we are talking about a specific tape measure, not just any tape measure in general.

If Italian wanted to speak more generally, it might use a different structure, depending on context.

Because the subject is singular:

• Il metro da sarta = singular

So the verb must also be singular:

• resta

If the subject were plural, the verb would change too:

• I metri da sarta restano in sartoria.

This is basic subject-verb agreement in Italian.

No. This is a very standard Italian sentence pattern:

• Subject: Il metro da sarta
• Verb: resta
• Place phrase: in sartoria

So it follows a normal order similar to English:

• The dressmaker’s tape measure stays in the tailor’s shop.

Italian word order can be more flexible than English, but nothing unusual is happening in this sentence.