Let's face it, racing is dangerous and needs to be treated with respect. Fire is a very real possibility in any car, and you need a racing suit to get behind the wheel with every sanctioning body.
Available in different configurations, some suits will be single layer, some multi-layer. Be sure to check the rules for your racing series to make sure you know what you need for homologation.
Racing gloves can be thought of as the second half of the interface between driver and car. Not only will they keep your hands safe in the event of a fire but they can also help you mentally. When the gloves to on, you're really driving.
If they're uncomfortable, you'll be miserable, so be sure you get the right pair for your preference.