Those that ride in winter weather must have warm gloves. This is expensive but worth the price. Gloves always seem to fail to keep hands warm after a half-hour of riding in below freezing temperatures. An option are heated gloves with their own battery source or a connection with the motorcycle can be put in by a motorcycle mechanic. The wind acting against the hands makes the actual temperature coming into contact with the hands even lower.
When hands are frozen you can have a problem with the gear shift and brake lever. Get to a warm place when your hands are warm. Boots covering the ankle are essential. They should have a good grip so your feet do not slide when stopped. Motorcycles are heavy and if one should fall on your ankle, the best protection possible should be on your feet.
Helmets that cover the face are a must and glasses under the shield are a plus. German style helmets are not going to give the protection in that hour of need. Full Face or at least an open face helmet should be in the possession of the motorcyclist. If a state does not require a helmet, this does not mean you should not wear one.
A jacket with padded elbows and shoulders is a must. Pants that will not shred and give you a road rash infection should the motorcycle slide are needed. They can be of a textile material of leather like the jacket. In summer riding mesh jackets with armor in the shoulders, elbows and back are a must. Do not be foolish and ride your motorcycle in sneakers and shorts. If a state does not require a helmet, this does not mean you should not wear one.
Use some common sense when riding. A motorcycle mishap is less forgiving than one occurring with a car in the vast majority of cases.