Clothing
Vests and Shorts
Most brands of these are reasonably good, so just make sure they are comfortable and don't have any seams that will rub significantly.
As with your shoes you should use your vest and shorts in advance to check this out.
Up until a few years ago, the advice was to wear natural fibres (partiucularly cotton) as it was kinder to the skin, however the more
modern generations of clothing are a lot better.
Sports Bra
Clearly just for women! There are no muscles in your breast, and without a good sports bra they will bounce whilst running.
This is not only uncomfortable, but can also lead to longer term damage to breast tissue. Make sure you run with a decent sports bra.
Outer Clothes
You will have several requirement from the other clothing you purchase. To keep you
Warm
Dry
Let your body heat escape
This all needs to be done with a minimum of weight in the clothing.
We suggest that you'll need to following in the course of normal preparations for a marathon
T-shirts - ideally made from wicking material
Running Leggings and cycling shorts
Sweatshirt - not too baggy, generally these should be fairly thin (you could wear two if it is really cold) and well fitted.
Tracksuit trousers - for warming up and cooling down
Waterproof Layer - a top (preferably breathable) is a must, you might also want to buy trousers.
Good socks - these will help reduce blisters, some of the double layered socks work well for this (but can be tough to put on
after they have been washed as the inside layer gets screwed into a ball in the toe of the outer layer!)
This may sound like a lot, but for a couple of hundred pounds you'll have enough gear to last you through several marathons!