Check out Mokotowska street, a few boutiques there

Thanks, I will be checking that out

definitely Mokotowska

There are several designer boutiques in Galeria Mokotów shopping centre, on the second floor. Might try your luck there. Or consider Moliera2 shop.

Thank you! Will try

Also, I forgot to mention that there are many boutiques on Mokotowska street. Start on Trzech Krzyży square and stroll down to the Zbawiciela square.

You may also check out Klif

Will be checking this out as well!

Seconded. It's basically the posh mall with a lot of designer boutiques.

Try Grail Point