Your Basic Rig
--- The first thing to understand is that your IDPA rig can be used in USPSA, but not necessarily vice-versa.---
--- So, if you are wondering where to begin, gear up for IDPA. ---
Don't buy poor quality gear. If your gear sucks, your performance will suffer.
Click on the below links to learn more about each topic.
Mag Pouches
Magazines - You are going to need AT LEAST 3 magazines; be sure to have 4 or more.
Concealment - Most IDPA stages require a concealment vest. You can certainly use a shirt or jacket, but clearing your pistol while wearing a true concealment vest is likely to be faster.
Some Additional Recommended Accessories
Speed Loader - UpLula Loader
Microfiber cloth - to clean your mags
Grip Powder - Chalkless Grip Enhancer