1) Headgear - Safety over fashion must be your primary consideration when choosing the right headgear. Wear only headgear which has been approved. Baseball hats, cowboy hats, derbies and bicycle helmets must not be worn in place of an approved equestrian helmet. Approved equestrian helmets usually cost $60 and up. This is quite a bargain compared to the expense you might incur if you suffer a head injury.
2) Shirt - A T-shirt or sweatshirt that fits you perfectly - not too loose and not too tight - will be enough if you're not performing on a horse show. Choose a bright-colored shirt if you're going on a trail. Should you get lost, it will be easier for rescuers to track you in a highly-visible shirt. You can wear a vest or winter coats over your shirt when the weather gets cooler while you're riding. Most riders choose vests over coats because they don't restrict arm and shoulder movements.
3) Pants - Riding tights are usually made from two-way stretch fabrics. They are designed with leather knee and seat patches to provide more grip. During cooler months, you can wear winter riding pants which are made from fleecey material for warmth.
4) Footwear - For safety purposes, next to an equestrian helmet, an excellent pair of boots for horse riding is the most important article of clothing when horse riding. There are many different styles of boots. Choose whatever is comfortable and suitable for your type of riding. Make sure that your choice of boots gives full support to your ankles.
Do you want to know what kind of boots can keep you comfortable and safe while horseback riding? Read this detailed infographic from Horseland.