What you choose to wear when you cycle does depend somewhat on the actual type of cycling you want to do. If you are competing then it is probably best to choose high performance, purpose made clothing rather than what you just woke up in that day. If you are just popping down to the local post office then you can be much more relaxed over your choice of clothing.
In general , try to stay clear of clothes that are too loose and wear suitable footwear such as trainers or other types of shoes that provide support. It may be advisable to wear multiple layers so that you have some control over your body temperature.
The most important thing you should wear is a helmet, it’s not just for kids but applies to everyone. You should wear a helmet every single time you go on a bike ride as it could save your life. Make sure to choose a helmet that actually fits your head, in the event of an accident you want it to protect your head and not move out of position.
As a man you can invest in some padded biking shorts this can make cycling more comfortable by preventing chafing. For women, you should purchase a suitable sports bra that fits well and provides adequate support.
If you are new to cycling then this might come as a surprise to you but you should find a great pair of socks. Those with a bit more experience know that wearing the wrong pair of socks can make cycling uncomfortable. You need to go for a pair of socks that will help keep the moisture away, whilst not letting your feet becoming too hot. Once you find a brand of socks that you like you should stock up on them especially once they come on sale.
If you are cycling at night or other times when there is poor visibility you should wear a reflective vest. This will make you much more visible to other road users and will reduce the probability of you being involved in a road accident as the other person couldn’t see you.