LOOKING FOR GOOD SHOPPING PLACES IN BELGRADE ! (Belgrade)

Dear fellow Internation Members,
I'm the Internations Ambassador for your little neighbor country Montenegro and off to Belgrade for a few days around Christmas (the catholic one), and desperate to find a few nice shops for clothes. As you may know if you visited Montenegro, we don't have the best offer in terms of clothes here.... OK we have a beautiful country instead that's true.
But anyway, really hoping to find a nice really warm coat (it's freezing now in Montenegro - unusual....) and warm boots, which I'm sure will also be very useful for my stay in BG.
Anyway, any address, or shopping area advice is welcome. Good quality clothes if possible (not the chinese synthetic stuff).
Thanks in advance for any help!
Cheers,
Carine Hitchcock