This is actually one of the most common question I get. Polish lawyers who qualified as advocates, legal advisors, judges judges or prosecutors, all have have to wear black robes (gowns) while in court.
Advocates wear robes with a green jabot (also calles a bib) and green lining.
Legal advisors wear robes with a blue jabot and blue lining.
Judges wear robes with a purple jabot and purple lining.
Prosecutors wear robes with a red jabot and red lining.
Polish lawyers don't wear wigs! :)