"Czyj jest ten płaszcz?"

Translation: Whose is this overcoat?

[Helena834099]

Whose overcoat is this?

[Jellei]

Works.

[hadasidas123]

Very odd sentence

[vytah]

It's perfectly normal, although it's a bit more common to hear Czyj to płaszcz?

[Mark958555]

The English is a little weird, though. (But the correct English of "Whose coat is this?" is accepted, so it's not a big problem.)

[Trofaste]

Does "czyj" change gender with the object being talked about?

[Jellei]

Yes.

Czyj/Czyja/Czyje for singular, Czyi/Czyje for plural.

[TseDanylo]

Just like the Ukrainian "Czy ce pal'to"

[Matt570567]

Whose is the coat sounds very weird to me as a native English speaker.

[Jellei]

'the' is merely accepted, as an... interpretation of 'ten'.

Oh wait, I just assumed that, but it's a starred answer. Removed from starred answers.

[johnesh1]

To whom does it belong?

[Jellei]

Works. If you use "this coat" instead of "it" ;)