Shoes: the accessory that actually matters
Court shoes, built for lateral movement, are meaningfully different from running shoes, which are designed primarily for forward motion. See injury prevention for the ankle-injury risk of using the wrong footwear — this is genuinely the highest-impact gear decision beyond the paddle itself.
Indoor vs. outdoor balls
Indoor and outdoor pickleballs are not interchangeable despite looking similar. Outdoor balls are generally heavier and harder, with smaller, more numerous holes designed to resist wind and hold up on rougher outdoor court surfaces. Indoor balls are lighter with larger holes, suited to smoother indoor surfaces without wind interference.
Accessories worth owning
An overgrip (see grip size and overgrips) and a paddle cover are both low-cost items that provide real, direct value — better control and protection for your paddle's face and edge, respectively. A dedicated paddle bag with separate compartments for balls and accessories is a genuine convenience upgrade if you play regularly.
What's optional
Beyond shoes, balls and the basic protective accessories above, most other gear — specific apparel, wristbands, cooling towels — comes down to personal preference rather than performance impact. It's reasonable to skip these until you know what you actually want from your setup.

