But once you start clocking up more mileage, running longer races, and running in all weathers, you can make your life a bit more comfortable if you get some more specialist clothes. For example cotton t-shirts are fine if you're running a short distance in cool weather, but run more than 10km, or in hot or wet weather, and chafing will start to cause problems, and running in a sweat-soaked t-shirt is pretty uncomfortable. Similarly, once you start running half marathons or longer, any little minor niggles with gear can, over the course of two or three hours, become major problems. So since I started running I've tried out quite a lot of different gear and it's probably worth talking about it for anyone who might be just starting out.
Starting from the ground up, I've always run in Reebok shoes. It's not one
Since then I've had four more pairs, one of which I've worn out but the remaining ones are still usable and very comfortable. As I mentioned, they are not expensive shoes, and it's often possible to save money on running shoes by waiting until a manufacturer releases a new version of a particular shoe - often the older version gets sold off cheaply.
In terms of socks, so far I've tended to wear any thin, comfortable sports socks I could find. The most comfortable ones I have are made by Saucony and were sent by the Brighton Marathon team as an apology when the training t-shirt I'd ordered from them was very late to arrive. Unfortunately I've not found them for sale anywhere else, so I'm still on the lookout for some really comfortable ones.
I wear Ron Hill tracksters in winter and their shorts in summer. The
tracksters are maybe a bit old-fashioned but they have a good balance of stretchiness, comfort and support, and they're warm enough for most winter days. Their shorts are light and comfortable and most have either internal key pockets or external zip pockets which are handy for car keys, mobile etc.

I did try a pair of New Balance shorts but they weren't so comfortable so I'll be sticking with Ron Hills for now. Apart from anything else, it's nice to support a British company.
I also have some skins compression shorts and tights. The tights are most useful for wearing after a long run and
seem to help prevent muscle stiffness and soreness. I have also worn them when running, and they are useful for extra warmth and support on really cold icy days worn underneath my tracksters, but they are a little too constricting to be comfortable to wear for every run, and the seams can be a little uncomfortable.

The shorts are useful in spring and autumn when it's too hot for tracksters but not hot enough for shorts yet. Again though, the seams can chafe a bit when you've been wearing them for a while. But they are comfortable to run in and give your thighs and backside some support.
Briefly, another good weekend's running - 4 miles in Dulwich on Friday lunchtime, 15 miles in Greenwich on Saturday (another new distance record for me) and a rather leisurely and hungover 4 miles in Hertfordshire on Sunday after a late Saturday night at a Burns supper with friends.
So, a good start to the 1000 mile / marathon challenge, with 89 miles completed in January.