أَسْكُنُ فِي مِعْطَفٍ بُنِّيٍّ واسِعٍ.

Well, it sounds confusing in Arabic too but the translation seems to be correct. Duolingo is often using this kind of quirky sentences (like "My computer is my cat's chair ..."). I think they are doing this on purpose. Maybe it helps people to remember new words :-)