about weather and clothes

hi I am going to Japan in April and I want to know if it is too cold, please dont say me that the temperature is 14 or something similar. probably is stupid but what I want to know if I can use leggings or if it is to cold for that type of clothes.

I've seen women in leggings in the dead of winter all across Japan, but if it will be too cold for you depends on where you're going, where you're from, and when in April you'll be here.

See this page for more info:
http://www.japan-guide.com/e/e2273.html

It depends on what part of Japan you intend to visit. If Tokyo and Osaka area light clothing will be OK but if you intend to go inland or in mountainous area you will need some warm gear