Whats all this about..... paulj48... undercover fashion police ??
Our bodies adapt in different ways to the temperatures. Some of us are quite slim, and don't carry alot of weight / fat, so we tend to feel colder, others have more body fat which keeps them more insulated.
I find that in winter I need more layers on to keep warm EVEN on a long run. In fact anyone who regularly does long runs (and I mean 15 miles plus) knows that as your body begins to tire you can start to feel cold, even though you may still be sweating.... and that applies not only in winter but also to running in warmer conditions.
I took part on that training day and It was cold, so I dressed accordingly, and in what was comfortable TO ME.... sorry if you didn't like what people were wearing but I for one wont be wearing a vest and shorts until March at the earliest !!