Hi Anna,
I'm researching a famous Russian attraction where you can see people in special uniforms. The Kremlin in Moscow fits perfectly. It is located on Red Square beside the Kremlin walls. There you can see the Kremlin Guards during the Changing of the Guard ceremony near the Tomb of the Unknown Soldier. The guards wear bright red tunics with gold trim, dark trousers, and tall black fur hats. They stand, march, and perform ceremonial duties, guarding the Kremlin and greeting visitors with formal salutes.
Best wishes, Alex from Moscow