2 added 9 characters in body
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It is elliptical:

[It] fits, doesn't it?

It means "to jibe, to agree".

For the ellipsis compare:

We should paint the ceiling first and then the walls. That way we won't splatter the walls with ceiling paint.
-- Makes sense.

Such ellipsis is very common in informal conversation.

We painted the room.
-- Looks good!

It is elliptical:

[It] fits, doesn't it?

It means "to jibe, to agree".

For the ellipsis compare:

We should paint the ceiling first and then the walls. That way we won't splatter the walls with ceiling paint.
-- Makes sense.

Such ellipsis is very common in conversation.

We painted the room.
-- Looks good!

It is elliptical:

[It] fits, doesn't it?

It means "to jibe, to agree".

For the ellipsis compare:

We should paint the ceiling first and then the walls. That way we won't splatter the walls with ceiling paint.
-- Makes sense.

Such ellipsis is very common in informal conversation.

We painted the room.
-- Looks good!

1
source | link

It is elliptical:

[It] fits, doesn't it?

It means "to jibe, to agree".

For the ellipsis compare:

We should paint the ceiling first and then the walls. That way we won't splatter the walls with ceiling paint.
-- Makes sense.

Such ellipsis is very common in conversation.

We painted the room.
-- Looks good!