Final answer:
In the 1930s, men's sportswear was practical and functional, with tennis players wearing white flannel trousers and long-sleeved shirts, baseball players in flannel jerseys and pants, and football players in leather helmets and padded pants.
Step-by-step explanation:
In the 1930s, men's sportswear was influenced by the practical and relaxed styles of the 1920s. Athletes' attire was designed for ease of movement and functionality. For example, male tennis players often wore white flannel trousers and a long-sleeved shirt with a tie, a style popularized by sports figures such as "Big Bill" Tilden. In baseball, exemplified by Babe Ruth, the typical outfit consisted of flannel jerseys, pants, and a cap, tailored for the sport. Football players, like Red Grange, donned leather helmets and padded pants, which were quite minimal compared to today's protective gear.