bendi85 wrote:
So 15 degree need to wear how many layer?
I'm going in March, should be around same temp?
Depends on the individual. I can stand 15 degrees with a single layer of long-sleeve clothing with light jacket if it's windy. To be safe, 2-3 layers should be fine. If you have a thick jacket, 2 layers is ok as long as it can block out the wind.