Layering is the key because as you warm up, you can remove layers and as you cool down again you can just put it back on. Plus heat gets trapped between layers of clothing so several thin layers are better than one or two thick layers. Do consider how you can carry them however; a long sleeved tee can be tied around the waist, gloves tucked into your waist band.
Consider the design of your kit, a wind proof/water proof jacket is an essential piece of winter clothing in a bright bold colour, preferably high vis and boasting reflective panelling. Some jackets come with removable arms which can be stowed in your pockets or alternatively the whole thing can fold up small and fit into a bum bag.
Steer clear of anything made from cotton. You will still sweat and cotton retains the moisture resulting in you feeling very cold. Consider investing in a pair of running tights made for winter running, these will keep your legs far warmer than a bagger version.
Don’t let the rain put you off, your skin is after all water proof! Invest in a jacket which is at least shower proof and preferably water proof, to keep the worst off. A baseball cap will keep water out of your eyes.
Strong northerly winds during the winter can chop around 10 degrees off the air temperature and really start to bite at your exposed skin. Wear a wind proof jacket, gloves, ear protectors or a hat, and a snood. Try to pick sheltered routes or those that change direction frequently so you aren't blasted by icy winds for long periods of time. If you are expecting to be out for a long period of time training at a low intensity the additional use of wind-breaker/water proof trousers effectively support heat storage as well.
In the summer you will need light and airy clothes. A wicking t – shirt or vest will help to keep you cool in the midday sun. You can also get cool packs which sit around the neck to help keep your temperature down.
If you can brave it, a pair of shorts will also help to keep the temperature down and keep you cool.
Also sunglasses are essential to protect your eyes and even more so to keep the wrinkles at bay!