Do I need different race jackets for different disciplines (SL vs. DH)?

Not necessarily—most racers use one race jacket across all disciplines. However, some elite-level racers prefer discipline-specific features: slalom racers may want extra forearm padding for gate contact, while speed event racers may prioritize the most aerodynamic fit possible and minimal features. At most competitive levels, a single well-fitting race jacket serves all disciplines. The more important discipline-specific equipment is the race suit (speed suits for SG/DH vs. padded suits for SL/GS).