Text on the back of this postcard includes:
- ATHENES - Costumes helleniques
- ATHENS - Hellenic dress
- ATHEN - Hellenische Tracht
- A. HASSID S.A. PRAXITELOUS, 14, ATHENES
- Procede Mexichrome
- Made in France
That, of course, is the Parthenon in the distance, behind these handsome young men and women.
"Hellenic" is a synonym for "Greek".
If you're interested, more on traditional Hellenic dresses can be found here and here.