Wear bright and reflective clothing when you ride your bike so that other road users can easily see you.
Reflective gear can be as simple as a leg or arm band or a vest you can wear over your top. It is a cheap and effective way to make your cycling a lot safer.
Wear comfortable clothes and shoes that you are happy to exercise in. Remember you'll warm up as you cycle.
Check the weather forecast before you leave and take a waterproof jacket if you expect wet weather.
For added safety, you should tuck in any loose clothing and shoe-laces so that they do not get caught in the moving parts of the bike.