Following WW2, there are no French build combat and jump helmet available. With a very large utilization in the French army, the American M-1 helmet is representative of French paras silhouette in Indochina.
A number of versions with different modifications, essentially in regard of the strapping specific to jump helmets, will be in coexistence during the conflict.
Here are some view of the way to wear them
The use of a heavy helmet in Indochina is widespread in combat situation, more so in siege like Dien Bien Phu. The use of more lightweigth headgears (bush hat, beret, cap) is generaly reserved for less tense situations and for patrol.