Protecting yourself if the unfortunate should occur is paramount.
I personally wear a one piece leather suit, full length gloves, full boots, a quality helmet, and a full back protector.
The quality of the kit available across the market is excellent and its up to the fit, price and level of protection from everything as a whole that you should consider.
Be aware of fake brands and buying “replica race suits” online. You may as well go into Redgate in shorts.
I would highly recommend going to your local bike shop and trying kit on. Most leather suits only feel comfortable in the racing position, and new suits do take a bit of time to break in.
I’m not going to recommend brands as different kit fits different people. I can’t even get my head into an Arai which is a shame as they look the business.
Some track day companies hire kit so don’t think you have to go out and spend hundreds of pounds before you even get to the track.